I recently changed from W2K where BOINC manager 6.10.58 was great to Win7. Here, BOINC manager 6.10.58 is working generally fine except for one point: In the general manager preferences I set it to "switch between applications every 30mins" but it does not do that. I have a SETI and an Einstein work package in the task list but only the SETI will be active if I resume both of them. The deadline for the SETI task is mid April, the Einstein beginning of March. Therefore I would assume that Einstein should also be worked upon but it doesn't.
Any clues where to check?

I recently changed from W2K where BOINC manager 6.10.58 was great to Win7. Here, BOINC manager 6.10.58 is working generally fine except for one point: In the general manager preferences I set it to "switch between applications every 30mins" but it does not do that. I have a SETI and an Einstein work package in the task list but only the SETI will be active if I resume both of them. The deadline for the SETI task is mid April, the Einstein beginning of March. Therefore I would assume that Einstein should also be worked upon but it doesn't.
Any clues where to check?

Yes, stop suspending WU/Project. Make sure that the project resource share are equal. Leave Boinc do its job of balancing the project shares and eventually you will see switching between project happen.

The STD (short term debt) which Boinc uses to determine which project to run and LTD (long term debt) used to choose which project to get work from are probably out of whack and will likely to take some time to self correct. So just avoid micromanaging Boinc and it will eventually work as you're expecting.

Deadline don't come into play unless a WU is in danger of being late, which shouldn't happen with a resonable cache size.

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Boinc V 7.4.36
Win7 i5 3.33G 4GB NVidia 470

Same problem here. Actually it wasn't a problem until the last day or two and I'm still not sure the cause since I haven't done any manually suspending the work.

Having said that, I really don't like the behavior. If the user does suspend the processing for whatever reason... then that's a user decision, not the project's and shouldn't affect the debt calculation...