Hrm. I just completed Nalia's quest as a Fighter/Thief

At the end she *didn't* offer me the keep because I wasn't a warrior. I tried the game editor to set the class to fighter and tried again, she turned him down again.

I'm not sure whetre the problem lies, I have done the thief stronghold quest as a fighter/thief and it went fine. But the warrior stronghold doesn't work. Is there a specific reason for this?

Because you already have a stronghold?

Aha. I thought a dual-classed character was allowed to have more than one stronghold. harumph.

Oh well.

There is a mod that allows you to have Multiple strongholds.

Its a little buggy, to my expirience. Ive used it once, and not gonna use it again...

If you're willing to open the game editor and, well, cheat, then surely you'd be willing to cheat again.
Go to Global Variables, scroll down, and delete, "PLAYERHASSTRONGHOLD" and make yourself a fighter. That should do the trick.

Last time through the game, I had all the strongholds (except for the thief one). Yesterday, I completed the Bard Stronghold quest, but for some reason, I didn't get the play house. Why???

.... Are you a bard..? Do you already have a stronghold? And do you mean you didn't get the deed, or you didn't get to keep it?

I didn't get the deed at all. And I'm a Wizard Slayer, but since I have Multiple Strongholds installed, I should be able to get it. I already got the Priest stronghold so far, so I know that it's still installed.

Mm.. I know nothing about the mod except it's buggy. And forgive me if I'm insulting your intelligence, but current circumstances compel me to underestimate everything and everyone I do not know personally... So I'll ask. (Hell, I already asked if you were a bard).. SPOILER WARNING.
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You *did* set Raealis And Company free from the prison? She should give you the deed in the prison itself... If not, then perhaps someone who knows more about the mod can help you.
Or maybe she sensed your desire to kill mages and decided she didn't like you.
Your call.