Since October 30 (or 31) repeating task are not occur in my Today / Tomorrow lists anymore. The only exception is a task, which was edited recently - its next occurrence appear after edit and save.
That's just terrible. Service went unusable immediately. I need to go through my tasks manually to not missing important things I've entrasted to doit.

The only clue is that I've changed a timezone before that and since I use a few devices, it did a mess with dates for some time, as tz change wasn't sinced automatically. The task repeating stopped somewhat after that (not sure if it was caused by).