Here is a link to the replay. The issue starts around 25:45. http://s000.tinyupload.com/index.php?file_id=64942591416363962518
In case the link doesn't work, here's a description of the bug:
A deffkopta started attacking my Wraithknight Taldeer. She then used Scatter Shield and froze the kopta. However, the kopta's model was now attached to Taldeer, even when it came out of stasis. Other units could attack it, but Taldeer could not. What is not visible in the replay, is every time I issued a command for Taldeer to attack the kopta, I would get the following error message: "Requires: NOT OR." Other units finally killed the kopta, detaching it from Taldeer's model.