I noticed that my cron jobs were not being run since I upgraded from FCron 3.0.3 to 3.0.4. Running

confirmed this: some (daily) jobs were scheduled for next month. Some jobs even had their next execution time in the past. Something got hosed.

Fortunately, it's not hard to fix this. For every user run as root:

to reschedule all your jobs. It's weird, this shouldn't have happened in the first place.

With fcron I couldn't find a way to enter a command with the following schedule: run daily, except on each first of the month, a command between 5am and 7am or between 6pm and 10pm.