nsViewManager.cpp, and reverting to version 3.100 of nsViewManager.h. Note that beard's backing out of the negative z-index code did NOT fix the problem. This means the bug lurks somewhere else in the file. git-svn-id: svn://10.0.0.236/trunk@41768 18797224-902f-48f8-a5cc-f745e15eee43