Second Windows Monitor - glitchy

Hi all,

I've just upgraded to Windows 7 64bit which runs nicely BUT when using my second monitor (VGA) as a vegas (10e - 64 bit) preview it glitches the video and audio but another BUT that when I view the same segment of video in the small video preview window it is perfectly smooth. It's only when I hit the "Video Preview on External Monitor" that the video and audio glitch.

The project is a 720P PAL project. The project itself is just 10 AVI (Lagarith codec) files - no effects etc. Changing down from Best (Full) to Preview (Half) solves this but it doesn't make sense. It should be the same in either the small video preview window or the External Monitor.

I've tried other video CODEC encoded files and they react the same way. So I've ruled out the codec.

I've tried toggling all the options within the video preview window without any noticable solution.

My only thought is that the video drivers could be buggy. I'm using a Nvidia 8400 GS which is only a basic 256M card which should be fine for video editing.

My new audio box is a RME Fireface 400 which have had problems with much earlier versions of Vegas.

Any leads greatly appreciated.

Steve R.

Amongst Projects
--------- Sound, Visual and Electronic Content
projects.amongstmyselves.com