A lot of our users run into schedules placed on sheets (i.e material take-offs, the sheet list etc) not updating on the sheet, even though the correct values are displayed if viewing the schedule directly. This does not happen all the time of course, but it shows up now and again. This is potentially disastrous, say if one revises a reinforcement schedule, but the sheet that gets printed and sent to the client still displays the old values. It also undermines basic trust in the software from our users. One can force an update by e.g slightly modifying the column width (or restarting Revit) but the real issue is in realizing the failure to update.
I can appreciate that a bug like this might be hard to isolate, but it seems like a fundamental issue that must be resolved.