I'm having weird behaviour with Vegas.

I do not know if it's caused by the latest update or by the latest major Windows10 "fall creators" update.

I always use the same workflow and templates as a weddingfilmmaker, so i'm not doing any new or alternative.

1. I rendered a 1h:20m sony mp4 movie: at 100% it keeps hanging, won't stop rendering, although the movie itself is finished and playable.

2. Putting this same movie in a new Vegas window: audio peaks building begins at it's usual speed, but then slow at 40% and continues reading the peaks: 1 % per minute!

3. Rendering the audio file to a . AC3 takes 35 minutes.

Anyone any idea? grtz