do known issues exist when snapshots used with quotas ?

[Ensel Sharon]

I have read and re-read the recent discussions about snapshots, their
quirks, etc.

I am really getting some bad behavior out of a system using multiple
snapshots and the only recent change was the addition of user/group quotas
on that filesystem.

So ... no need for real details (unless you feel charitable enough to give
them) - just the quick question:  are there any known issues / suspicions
/ hunches / lore about bad things happening when snapshots are combined
with quotas ?

(running 6.0-RELEASE)

thanks again.