I have be seeking for this topic but feil to do so, if anyone know where else to post this i would be happy to go to an existing topic about this issue.
I have been running BOINC for a long time but today i noticed that i had 54 task to report, i had to force this, then i do not get any mor work, getting communication deferred and a time.

The log for the last 24 hour is this:


13.07.2016 10.22.54 | | Starting BOINC client version 7.6.22 for windows_x86_64
13.07.2016 10.22.54 | | log flags: file_xfer, sched_ops, task
13.07.2016 10.22.54 | | Libraries: libcurl/7.45.0 OpenSSL/1.0.2d zlib/1.2.8
13.07.2016 10.22.54 | | Data directory: C:\ProgramData\BOINC
13.07.2016 10.22.54 | | Running under account Paulen004
13.07.2016 10.22.54 | | CUDA: NVIDIA GPU 0: NVS 300 (driver version 341.92, CUDA version 6.5, compute capability 1.2, 512MB, 398MB available, 59 GFLOPS peak)
13.07.2016 10.22.54 | | Host name: DESKTOP-OH77L0A
13.07.2016 10.22.54 | | Processor: 4 GenuineIntel Intel(R) Core(TM) i5-2500 CPU @ 3.30GHz [Family 6 Model 42 Stepping 7]
13.07.2016 10.22.54 | | Processor features: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss htt tm pni ssse3 cx16 sse4_1 sse4_2 popcnt aes syscall nx lm avx vmx smx tm2 pbe
13.07.2016 10.22.54 | | OS: Microsoft Windows 10: Enterprise N x64 Edition, (10.00.10586.00)
13.07.2016 10.22.54 | | Memory: 7.96 GB physical, 9.21 GB virtual
13.07.2016 10.22.54 | | Disk: 237.92 GB total, 83.52 GB free
13.07.2016 10.22.54 | | Local time is UTC +2 hours
13.07.2016 10.22.54 | | VirtualBox version: 5.0.20
13.07.2016 10.22.54 | World Community Grid | URL http://www.worldcommunitygrid.org/; Computer ID 3550499; resource share 100
13.07.2016 10.22.54 | World Community Grid | General prefs: from World Community Grid (last modified 08-Oct-2008 23:53:49)
13.07.2016 10.22.54 | World Community Grid | Host location: none
13.07.2016 10.22.54 | World Community Grid | General prefs: using your defaults
13.07.2016 10.22.54 | | Reading preferences override file
13.07.2016 10.22.54 | | Preferences:
13.07.2016 10.22.54 | | max memory usage when active: 6112.49MB
13.07.2016 10.22.54 | | max memory usage when idle: 6112.49MB
13.07.2016 10.22.54 | | max disk usage: 83.90GB
13.07.2016 10.22.54 | | max CPUs used: 3
13.07.2016 10.22.54 | | don't use GPU while active
13.07.2016 10.22.54 | | suspend work if non-BOINC CPU load exceeds 25%
13.07.2016 10.22.54 | | (to change preferences, visit a project web site or select Preferences in the Manager)
13.07.2016 10.22.54 | | Suspending GPU computation - computer is in use
13.07.2016 10.22.54 | World Community Grid | Sending scheduler request: To send trickle-up message.
13.07.2016 10.22.54 | World Community Grid | Reporting 54 completed tasks
13.07.2016 10.22.54 | World Community Grid | Requesting new tasks for CPU and NVIDIA GPU
13.07.2016 10.22.59 | World Community Grid | [error] Can't parse task in scheduler reply: unexpected XML tag or syntax
13.07.2016 10.22.59 | World Community Grid | [error] No close tag in scheduler reply
13.07.2016 10.49.30 | | Resuming GPU computation
13.07.2016 10.58.03 | | Suspending GPU computation - computer is in use
13.07.2016 10.59.34 | World Community Grid | task ugm1_ugm1_26602_2148_1 suspended by user
13.07.2016 10.59.34 | World Community Grid | task ugm1_ugm1_26602_2148_1 resumed by user
13.07.2016 10.59.37 | World Community Grid | task FAH2_000100_avx40812_000013_0002_027_0 suspended by user
13.07.2016 10.59.37 | World Community Grid | task FAH2_000100_avx40812_000013_0002_027_0 resumed by user
13.07.2016 10.59.39 | World Community Grid | task FAH2_000100_avx40812_000013_0002_027_0 suspended by user
13.07.2016 10.59.59 | World Community Grid | Sending scheduler request: To send trickle-up message.
13.07.2016 10.59.59 | World Community Grid | Reporting 54 completed tasks
13.07.2016 10.59.59 | World Community Grid | Not requesting tasks: some task is suspended via Manager
13.07.2016 11.00.03 | World Community Grid | Scheduler request completed
13.07.2016 11.01.10 | World Community Grid | update requested by user
13.07.2016 11.01.14 | World Community Grid | Sending scheduler request: Requested by user.
13.07.2016 11.01.14 | World Community Grid | Requesting new tasks for CPU
13.07.2016 11.01.16 | World Community Grid | [error] Can't parse task in scheduler reply: unexpected XML tag or syntax
13.07.2016 11.01.16 | World Community Grid | [error] No close tag in scheduler reply
13.07.2016 11.01.21 | World Community Grid | update requested by user
13.07.2016 11.01.26 | World Community Grid | Sending scheduler request: Requested by user.
13.07.2016 11.01.26 | World Community Grid | Requesting new tasks for CPU and NVIDIA GPU
13.07.2016 11.01.28 | World Community Grid | [error] Can't parse task in scheduler reply: unexpected XML tag or syntax
13.07.2016 11.01.28 | World Community Grid | [error] No close tag in scheduler reply
13.07.2016 11.01.31 | World Community Grid | update requested by user
13.07.2016 11.01.33 | World Community Grid | Sending scheduler request: Requested by user.
13.07.2016 11.01.33 | World Community Grid | Requesting new tasks for CPU and NVIDIA GPU
13.07.2016 11.01.34 | World Community Grid | [error] Can't parse task in scheduler reply: unexpected XML tag or syntax
13.07.2016 11.01.34 | World Community Grid | [error] No close tag in scheduler reply
13.07.2016 11.04.12 | World Community Grid | General prefs: from World Community Grid (last modified 08-Oct-2008 23:53:49)
13.07.2016 11.04.12 | World Community Grid | Host location: none
13.07.2016 11.04.12 | World Community Grid | General prefs: using your defaults
13.07.2016 11.04.12 | | Reading preferences override file
13.07.2016 11.04.12 | | Preferences:
13.07.2016 11.04.12 | | max memory usage when active: 6112.49MB
13.07.2016 11.04.12 | | max memory usage when idle: 6112.49MB
13.07.2016 11.04.12 | | max disk usage: 83.50GB
13.07.2016 11.04.12 | | max CPUs used: 3
13.07.2016 11.04.12 | | don't use GPU while active
13.07.2016 11.04.12 | | suspend work if non-BOINC CPU load exceeds 25%
13.07.2016 11.04.12 | | (to change preferences, visit a project web site or select Preferences in the Manager)
13.07.2016 11.04.23 | | Re-reading cc_config.xml
13.07.2016 11.04.23 | | log flags: file_xfer, sched_ops, task
13.07.2016 11.06.10 | World Community Grid | Sending scheduler request: To fetch work.
13.07.2016 11.06.10 | World Community Grid | Requesting new tasks for CPU and NVIDIA GPU
13.07.2016 11.06.12 | World Community Grid | [error] Can't parse task in scheduler reply: unexpected XML tag or syntax
13.07.2016 11.06.12 | World Community Grid | [error] No close tag in scheduler reply
13.07.2016 11.13.41 | | Resuming GPU computation
13.07.2016 11.19.31 | World Community Grid | Sending scheduler request: To fetch work.
13.07.2016 11.19.31 | World Community Grid | Requesting new tasks for CPU and NVIDIA GPU
13.07.2016 11.19.34 | World Community Grid | [error] Can't parse task in scheduler reply: unexpected XML tag or syntax
13.07.2016 11.19.34 | World Community Grid | [error] No close tag in scheduler reply
13.07.2016 11.46.31 | World Community Grid | Sending scheduler request: To fetch work.
13.07.2016 11.46.31 | World Community Grid | Requesting new tasks for CPU and NVIDIA GPU
13.07.2016 11.46.33 | World Community Grid | [error] Can't parse task in scheduler reply: unexpected XML tag or syntax
13.07.2016 11.46.33 | World Community Grid | [error] No close tag in scheduler reply
13.07.2016 12.14.06 | | Suspending GPU computation - computer is in use
13.07.2016 12.17.07 | | Resuming GPU computation
13.07.2016 12.17.54 | | Suspending GPU computation - computer is in use
13.07.2016 12.20.55 | | Resuming GPU computation
13.07.2016 12.27.13 | | Suspending GPU computation - computer is in use
13.07.2016 12.30.14 | | Resuming GPU computation
13.07.2016 12.36.38 | World Community Grid | Sending scheduler request: To fetch work.
13.07.2016 12.36.38 | World Community Grid | Requesting new tasks for CPU and NVIDIA GPU
13.07.2016 12.36.40 | World Community Grid | [error] Can't parse task in scheduler reply: unexpected XML tag or syntax
13.07.2016 12.36.40 | World Community Grid | [error] No close tag in scheduler reply
13.07.2016 12.40.46 | | Suspending GPU computation - computer is in use

There seems to be a problem at WCG. See in their forums: https://secure.worldcommunitygrid.org/forums/wcg/viewthread_thread,38825_offset,0

On page 10 there seems to be a workaround.