Since updating to VP13 build 428 I've had annoying freezing problems where it may take a second or two to stop playback. The title bar occasionally shows "not responding" during the pause and everything is frozen except the sound and video preview. All the meters freeze and mouse pointer freezes. I've tried it with and without my Nvidia GTX660Ti enabled. It's not audio latency or anything like that - it appears to be momentarily locking up. Doesn't always happen either, sometimes it stops/starts immediately like it always has but increasingly it's freezing up. I'm used to whizzing around Vegas, editing at top speed but this is making me pull my teeth out.

Any advice welcome.