When I use the pen tool to create a mask, the mask doesn't seem to apply. I have used this before and that section of the clip is normally supposed to go black, but when editing on this project, the selection just stays blue, and I'm not able to mask my clips together like I have in the past. I've looked all over the internet and on youtube and can't find anything to change this. I've looked at the settings but I'm not sure exactly where to look, and I have adjusted the transparency grid and nested the clips and nothing seems to change this. I then tried opening up a separate project and masked a couple of clips together and it worked like normal, so does anyone know why this particular project won't let me mask like normal? And it doesn't seem the be the specific clip, it hasn't worked on any of the selected clips.
Editing, Effects and Titles, Error or problem, How to
This might be a dumb question. But are you applying the mask to the correct clip? In your screenshot, the clip on V2 is covering the clip on V1. But you have V1 actively selected, which has the mask currently applied to.