osx 10.6.5, ableton 8.2.1. Latest xils full beta. 1 instance of xils initially, (where I experienced the problem) now I have 2 in the same ableton track. But set to different keyboard zones, so they arent playing simultaneously I guess. Dont know whether it helps but, although I couldnt save the behavior, if i changed the xils patch (without closing xils) the next patch would be fine and if i switched back, the behavior would still exist. Then If i switched too and from it would eventually go away.
Maybe try disconnecting and reconnecting the lfo pitch. It might have been slight edits that did it. Ill try again to find the behavior and see what more info I can give.