First time user everyone - so please bear with me....

I am having a ball putting together videos on Vegas Movie Studio Platinum 8.0.

However, when I go through the render process, I have to do it 2 or 3 times!

I go to the 'make movie' button, select that I want to save to my hard drive - and then set the file path, format etc.

It then starts the process - but when it finishes, it just reverts to the render settings. I then have to do this again.......and sometimes again.

Usually on the third attempt it goes through OK.

Any thoughts...?