To avoid confusion:
There is absolutely NO support for phpNuke on these forums. This includes nuke and phpBB that is built-in in nuke. Support is provided only for normal phpBB (or modded phpBB), but not nuke phpBB.
The reason is that phpBB in nuke is not phpBB. It is heavily modified version that is modified so much that it has nothing to do with phpBB at all. And themes for phpBB are not supposed to work with nuke phpBB so don't complain that some phpBB theme doesn't work with your nuke. If you want normal forum use normal phpBB, not nuke.