Oh my god Marco, I was doing your debugsql suggestion, started up a new PLSD with that setting, went into the same exact instance and package as I did yesterday, and now the hover is working. I did not cold-boot my PC. Yesterday when the hover stopped working, I did exit PLSD and start up a new PLSD application. But hover still didn't work.
Well it's working now. I doubt you want my debug file, so won't bother you with it.
Thanks. I've added the debugsql switch as a short-cut in case it happens again I will know what I need to do to provide more information.