First off, I'm not much of a masking genius, since I haven't used the tool much so far in my editing in Vegas (I just switched from WMM a little while ago)...so there could be something I'm missing here.
Here's my issue: I open up the Event Pan/Crop option, use the anchor tool to do my masking frame be frame...no problem there. But then I look at my preview window, and the masks I created in some of the frames aren't lining up to the scene correctly. For instance, I created a mask on one keyframe, and then a different one for the next keyframe, and the preview window showing the previous keyframe's mask on the second keyframe...hopefully, that sort of makes sense. In the Event/Crop tool, each mask looks fine, and perfectly lined up how I want them to be. But when I play the clip on the timeline, some frames look masked correctly, but others are just completely off.
Does anyone know why this is happening? Or what I'm doing wrong? I'm so confused and frustrated...if anyone could help me out, it would be greatly appreciated.

