When I browse (not playing, paused) through the project-to-be-rendered (not the clips itself), the current position pointer always lags behind, it seems sticky. Even worse, when I click on a certain point, the pointer goes to that position, the monitor is not updated and a second later, the pointer RETURNS to it previous position! Only the SECOND time I click on the position I'd like to go to, the pointer actually stays there and the monitor is updated. Sometimes, it doesn't want to go the my requested position at all, it keeps returning to the previous position.
It cannot be a speed or complexity issue as the source is mjpeg (intra frames only).
Maybe it's an issue with mjpeg in avi and/or 1080p? I think it's very strange because there are only intraframes in the file anyway. It's very reproducable here.