My most recent time through the game left me with a disturbing Keldorn bug as well... I couldn't let him rejoin after he visited his wife... one of those dreaded "You cannot initiate dialog. Keldorn appears busy." messages. So even though I was a LG Morninglord, I had to squash his dreams. Phooey.
Spoilerish... sorta...
The only way I found to fix mine was to go see his wife's lover, then insist that Keldorn stay with your party. It's probably a very similar bug... something having to do with him respawning after he leaves your party. Latch on to him like a barnacle and don't let go!
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Yar!
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