I've just updated the Einstein@Home scheduler to incorporate this fix. Users with a 4.19 BOINC client: please report if the problem is now fixed. (PS: you might want to consider updating. More recent BOINC clients work better and have a lot of nice features.)
Bruce

ALERT : Scheduler incompatible to CC4.19
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Likewise -- thank you for the quick post identifying the exact problem.
OK, I'll watch for your report.
Cheers,
Bruce
RE: Both Linux and Windows
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Wonderful! Thanks for confirming that the CC4.19 boxes are working properly again.
Cheers,
Bruce