I'm running some second HCC task. While it was active, I've opened the graphics window to take a look at it.

Some time later, as the task was preempted by some other one (while being kept in memory), I've noticed that the lower part of the window is blank (white) and some part at the right is black - no problem, just unrefreshed graphics window. Then I wanted to close it and got



True. The difference to other Boinc applications I noticed is, that their graphics threads remain running, while the tasks are preempted (and kept in memory). In HCC1 5.15's case the graphics thread seems to be paused and the worst drawback is, closing such window would kill the whole application. (Hopefully it would be safely restarted from the checkpoint upon its next turn.)

Why is HCC1 5.15's graphics thread being supended too? While opened during calculation, it is also not displaying any CPU consuming graphics, so the thread's CPU consumption is not the reason for this app (it was approx. 0.2% of the whole applicationon my computer). IIRC (at least some of the) other WCG's apps' graphics threads remain responsive, while the application is preempted, but I may be wrong.