Moving Layer Mask with Timeline crashes Photoshop

[bryaneward]

I am having an issue with animating using the timeline. Everything works fine except when I try and move a mask. If I want a mask to move to slowly reveal the layer, say from right to left, if I try and drag the mask over and release it lined up with the edge of the document Photoshop crashes/disappears. If I move it from the right edge to the center, it is fine, but if I move it to one of the edges it crashes. It does it on all the documents I have tried it on, not just one specific document. It has happened only since the latest update, which I did at the same time I updated my Mac to the latest OS. I have be using the timeline to animate things for years, never had this issue, I have no idea how to fix it. I am working on a 17" iMac.