Similar that for correct work Vegas 9 it is necessary to install all versions Microsoft.NET Framework - since 1.0 and to 3.5. Yesterday has install Microsoft.NET Framework 3.5 and 1.1 with additions and never Vegas 9 "lost" video though earlier at wiring of each plot of video "was lost".
Your opinions?
P.S. Vegas 8 demanded only Microsoft.NET Framework 3.0