Many moons since I last posted here, but here I am hoping one of you gurus can offer some advice to this problem. This is actually a problem that my Dad (88 years young) is having (and hence me :-) ). When starting Vegas 12 the start up window jumps to the left and becomes smaller then jumps back to the middle, but remains smaller. It then finishes starting but opens with a small window/workspace. Even selecting a saved Window layout doesn't correct it. Has to be manually set up to his normal layout. OK, not the end of the world, but opening ProType Titler for instance shows TWO work spaces of it (the titler) both in the same window! Which makes it impossible to use. I have never seen anything like this in all the years I've been using Vegas (from version 6).
Things I've tried so far;
Resetting Vegas to default (shift+ctrl on startup)
Complete clean re-install (removal of all Sony vegas related items in the registry and in Windows explorer).
Installed an older version (11). This fixed the problem at first, but on the next restart of Vegas the problem returned. I then tried Vegas 9. Same problem.
I don't have the option of installing a newer version than 12. I should add that both his and my versions of Vegas are running on Windows 10 with the latest updates. No problems whatsoever with mine. Wondering if a Windows update on his PC has messed something up? Any ideas will be gratefully accepted!