Please repost your system information, but instead of posting a screenshot, simply select copy, then paste that into a reply. Some info not shown might be helpful, such as library path, and any adapter 2.
In what way are the masks not working? I get no clue from your screenshot.
Your Camera RAW CACHE setting at the default value of 5 GB is way to small. Adobe admits that and calls for increasing it to at least 20 GB. This effects performance in Develop module. (but probably not your masking issue)