Admin account can't perform some operations, that another admin account can

Question

This is a little complicated to explain:
A friend of mine wanted to have 2 accounts on his brand new MacBook Pro 15" unibody (Mac OS X 10.5.6). I have set up them for him (let's call them account A and account B, at his request both with admin features) and installed some utilities (e.g. Perian, Flip4Mac, MPlayer, Skype etc...), all these in A. But he started to use B and already performed all the settings from his old computer (hours of work to set up everything) and he said, that the A account he wants just for seldom usage. I haven't seen any problem in this account priority switching, because I thought, that since they are both admin accounts, it doesn't matter. I was very wrong though:
- all the applications, installed in A account always show before launching the warning, that the app was downloaded from the internet - normally you see it just once, but here it shows up always. Very annoying.
- the worst part is that some operations always fail in B account, but perform normally in A account - Exporting movies in QT crashes in B, works in A
- Setting up PDF preferences in InDesign works in A, doesn't work in B (it sees Acrobat settings, but doesn't allow to work with them). Interesting part is, that InDesign was already installed in B account but works perfect only in A...
First step what I did in effort to fix this issue was repairing permissions (boot from installation disk, no good), then I erased the B account and performed repairing permissions again, but again still the same.
Is there any way how to force system to treat the B account (now the only account at the computer) as fully valid admin account, that can perform all the operations, that were able in A account?
I really wouldn't like to go back and start from scratch.

Answer 1

It looks like it's just a seriously corrupt account.
Make a new one, and see if it all works there.
We could probably track down the cause, but it would take a LONG time, and it would probably just be quicker to make a new account and transfer files, emails, etc.