First one I saw a few weeks ago I wasn't sure what happened and by the time we noticed it the DR logfile had been overwritten by a scheduled backup. So, on the one I did yesterday I set up a test since that customer wasn't using them anyway, and sure enough my Business Schedule fields were blanked out. I made sure to capture every log file I could think of before and after to send to tech support this time.
Not the first time I've found bugs in 3300/MCD/MiVB software. The real fun one was back when the old 3300 release 8 came out; first release that supported ring groups, and we found that when all members of a ring group were in DND and you called the RG, it rebooted the controller.