My clipboard stops working after a while; what's causing that?

After much investigation with an Apple engineer, this issue appears to have been caused by the break web view not being cleaned up properly, due to an Apple bug. Time Out doesn't do anything with the clipboard, but the Safari WebKit-powered web view was leaving it in an invalid state (technically a lock that was left in place).

Time Out version 2.1 and later include a workaround for this issue. If you experience it while using version 2.1 or later, please contact me.