The Collatz server is currently down due to a hard drive controller failure. New hardware should arrive in the next day or two. A complete rebuild of the operating system, BOINC, and the Collatz software and project setup will then need to be done prior to the project coming back online. As this will be a complete rebuild, there is no sense hanging on to any completed workunits at this time. So, go ahead and abort any workunits you have whether they are complete or not. I expect the project will remain down for the next 10-15 days while I set it all back up and test it. Sorry for any inconvenience. And yes, I will make up for the lost credits once everything is back up and running.

From the BOINC 6 FAQ:

Graphics and Screen Saver
The way that graphics work has changed significantly.
In BOINC 5 and before, the graphics module was built into the science application. Come BOINC 6, the science application and graphics application are two separate applications. This is done in case there are problems with the graphics, so that the task won't crash with a computation error. The graphics application may crash, but the computation continues.

Under Windows Vista the BOINC service runs on desktop 0, and the user display is sometimes desktop > 0. Under Vista a built in graphics display would not display at all.

When BOINC 6 is installed in protected mode (a service), it will only allow these new graphics applications to show the graphics or screen saver. Older applications will continue to work without a problem, they just will not show graphics or the project's screen saver. This mode also allows BOINC to run with no user logged in.

When BOINC 6 is installed in graphics compatibility mode (not a service), it will show graphics for both the older applications as well as the newer applications. This is the equivalent of multi-user mode and requires a user to be logged in.

Projects are urged though to make the new graphics applications.