Hi guys, im editing a little project and suddenly after working fine for 6months i cant get in to the properties meny somehow. I cant see an error message pop up or a code either, everything just freezes and when i try and click on something i get the error sound (Its like when you click on "open" and a window pops up and if you dont click in the window nothing happens but you get the error noise.). i have to tab out and click somewhere on my desktop to get out of it. everything else is working fine. does anyone know how i can fix this?
im using Sony vegas pro 15, on a windows 10 computer
Here ive recorded a video of what happens if it helps; 
Thanks in advance!
-Erlend