A few months later, but I thought I might as well report it: I had to uninstall this mod because of a stutter problem as well. When I reached the Underdark (had a party of Xan, Kivan, Viconia, Jaheira and Valygar), Viconia hit a point where she seemed like she really needed to say something to Valygar. They kept facing each other, the cursor would blink on an off, and it was impossible to get her to move more than a few steps. I tried to force-trigger her next talk (which would've been about the Aboleth, if memory serves), tried removing Valygar from the party, nothing worked. Then I removed the mod, and all was well.
It's a shame too, I was enjoying it
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I should also add that I have the La'Valygar mod installed, but I have no idea whether that's just a coincidence or if it actually had an impact on the fact that Viconia was trying to talk to him.
I was also surprised to get a love declaration from her at the end of
ToB...even though my PC was female and romancing Xan. But again, I have no idea whether that was due to having had this mod installed. And her epilogue played out correctly anyway, so it was just a "wtf" moment.