I've noticed on two of my CMSB installs (beta test site and live site) that some, but not all, of my scheduled cron tasks aren't running since I've upgraded from v3.57 to v3.59.
If I try to use the "run now >>" option, then it says something like this for the related tasks (even though they should be running twice daily):
Skipping Update Flat Files, function: flatFiles_generate (not scheduled to run again yet)
There's not a lot of documentation on how the CMSB cron system works, so I'm not sure how to go about testing and checking or changing the details (it's been years since I had to touch them)?