I am cleaning up some patches with pvar. I have labels whose text can change. I am using named comment objects for the labels, and tried passing "set new text" into a pvar bound to the comment object. It works fine once or twice, and then any additional text changes draw over top of the existing comment text. The following patch demonstrates (click back and forth between the two message boxes a few times). I see this behavior in version 4.6.3 on OS X 10.4.10 and version 4.6.2 on Windows XP. Once I open the patch for edit it corrects itself until the next time text is set.
I guess the workaround options are to use a message box or read-only textedit for my labels, or update the comment object with scripting.