My host with the GTX750Ti inside normally takes some 25 hours for a Gerard task.
The latest task that was crunched on this host was a Gianni which broke off after 20 hours yesterday.
No new tasks were available since then, until half an hour ago. While my other hosts were downloading new tasks, the 750Ti host brings the following notice in the BOINC event manager: "This computer has finished a daily quota of 3 tasks" - therefore, no tasks are being downloaded.
What's going wrong? How can I get BOINC to download new GPUGRID tasks?

Edit: Of course, I have closed BOINC and restarted it. Did not help to get rid of the problem.

You can't do anything about it, just wait.
Your host received a couple workunits from the bad batch named ADRIA_2OV5_CONF_CLOSED, and these failed workunits used up the daily quota of your host. This host will receive work from the server only tomorrow.

Many thanks, Zoltan, for your quick information :-)

(had I looked into my hosts list before, I would have seen these erroneous Adria tasks :-)

This host will receive work from the server only tomorrow.

If I see this right, new downloads are blocked not until start of new calender day, but rather until 24 hours after the last ADRIA computation error has ocurred, right?
Because I was hoping that immediately after midnight, a new WU would be downloaded, which was not the case. Even now it still brings this "daily quota of 3 tasks" statement :-(

This host will receive work from the server only tomorrow.

If I see this right, new downloads are blocked not until start of new calender day, but rather until 24 hours after the last ADRIA computation error has ocurred, right?
Because I was hoping that immediately after midnight, a new WU would be downloaded, which was not the case. Even now it still brings this "daily quota of 3 tasks" statement :-(

You have at least one WU running on ALL your computers.