» Fri Dec 02, 2011 6:56 pm
The issue is that there's a 255 character limit on entries in the ini files, such as Fallout3.ini (I think it's fairly common to allow 255 bytes for strings such as this). For BSAs, the entry in question is SArchiveList in the [Archive] section of Fallout3.ini. Details on dealing with this are explained in issue #1 in http://www.fookunity.com/forum/showthread.php?t=1155.
EDIT:
I guess I should also note that you don't need to have all BSA files listed under SArchiveList in Fallout3.ini, so this is unlikely to be an issue for most people. If the BSA filename begins with the name of an ESM/ESP file it will load automatically, so there's no need to add it to the ini (or select it in BSA Manager). If I recall, the "Fallout - ..." BSAs are an exception to this, due to hardcoding in the exe and/or other settings in the ini files.
So unless you have BSA files that aren't associated with an ESM/ESP data file, it's likely the only BSA files you need listed in the ini are the Fallout ones, and assuming you're using mods that use new assets, the AII! BSA file, which should be first in the list.
The other reason you might need to explicitly include a BSA file in that list is if it contains assets that replace vanilla (or another BSA's) assets. The BSAs that load first take priority (opposite to data file load order, where those that load last take priority), so in this case, you'd want to place the BSAs with any replacing assets toward the beginning of the list.