A problem occurred when adding video files greater than 1 hour duration.
Corel have provided these hot fixed for X9 and X10.
This post on the open forum refers.
If you have problems please download the appropriate zip file below.
This contains a uvMultiCamDB.dll file
Replace the existing file, I would first suggest re-naming the original as uvMultiCamDB_old.dll
Then paste the new file to the folder.
C:\Program Files\Corel\Corel VideoStudio X10
C:\Program Files\Corel\Corel VideoStudio X9