There used to be in the documentation but I just had a brief look and I can't seem to find it. I have an old, old list that might point you in the right direction, but be warned this is not current for 3.3 or 5.3 so use at your discretion (some of these folders don't even exist anymore!).
Parent folder Perms
Child Folder Perms
*except trackers, wiki and wiki_up which are 777
**except cache which is 777
You might be able to get away with 775 instead of 777.
As a last ditch effort if these permission don't work then try setting all folders to 775 (or 777 if you absolutely must) and all files to 644.
Xavi and co, do you see any value in putting this table in the documentation somewhere?