I've got 20 2.6Ghz AMD 64 FX machines running, plus my home 3.2Ghz Quad Phenom II running 4 BOINC projects. At the moment Seti and ABC have no work for some reason, and both Einstien and Rosetta are telling me I've reached the quota at 23??? Doesn't make sense to have the machines running with nothing working??? How does one change this setting, or do I have to join another project...
Most machines still have work, but this one has run out, and is getting nothing from any of the projects.
Rosetta has plenty of work available, but don't know if this limit is based on machine, user, or what.

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The quota is to stop "faulty" machines from downloading/trashing/downloading/trashing ... etc.
This quota is set by each project, and is based on several things, one of which is how many tasks a computer trashes. As more "good" results are returned, the quota will return to the project set maximum.

It's really something that you should ask about at your projects.

PS
SETI doesn't have Astropulse tasks, but plenty of other work.
Perhaps you just need to adjust some sort of preferences there.