I'm using MEP MX Premium on a Windows 7 64 bit PC.

Up till now, I've been using it for making a slideshow from stills. No problem.

Just lately, though, when I work with video, I notice the picture is redrawing, especially in pan shots.  Like droppouts in the days of time base correctors.  The display setting is 3D Hardware Acceleration.  If I change to Standard Mixing (default), the colour of the picture changes completely and incorrectly, but there's no 'redraw'.

I've done all the playback compensations with half resolution, etc. No difference.

Another unusual thing is when I right click on an object in the timeline to get its properties, nothing happens.

I've updated the drivers for my NVIDIA Quadro 4000.  I've also installed the latest update for MEP MX Premium. No difference.

I know all this is strange because...

1. I have MEP MX Premium on my Windows Vista PC.  No problems

2. The video files play perfectly in Windows Media Player on my Windows 7 PC.

Any ideas very welcome!

Seamus