Sorry to hear that. Unfortunately, I haven't been able to reproduce. Invert is working for me with 24.5 beta 043 & 044.
Perhaps something with your Preferences? If you delete your Preferences and relaunch Premiere, does it now work? (you can remove Adobe Premiere Pro (Beta) Prefs from your Profile folder)
I have this same problem. In both the Beta version and in the 2024 version. I've cleared preferences, cache, disabled plugins, restarted premiere, and nothing fixes it.
While I cannot generate the same issue from scratch, I am able to see the error message being generated in Mary's project.
Error message generated when attempting to interact with Mask (1) in the Effect Controls
In addition to not being able to enable the Inverted parameter, as best as I can tell the Mask Path cannot be selected as well.
PR24 - Unexpected Mask Behavior - Mask Path will not select. Mask will not invert. Interacting with Mask (1) generates a low-level exception error.
Mary, it would be good to know how to know how Mask (1) was generated in your project. I was able to delete Mask (1) and draw a new one and have it invert as expected. Of course, I'm not sure how important the exact shape of the current mask is.
Unexpected behavior (Premiere Pro 24.4.0 (Build 62), macOS Sonoma 14.4.1):
Mask Path cannot be selected
Mask will not invert
Interacting with Mask (1) generates a a low-leve exception error (Mask (AEVideoFilter:15)
Expected behavior:
User should be able to select the mask path, invert the mask, and edit the mask.
The mask was drawn manually with the pen tool. Deleting the mask and re-drawing did not work for me. Still would not invert and continued crashing. The only thing that ended up working was creating a new project, importing just that piece of footage i needed the mask on. Drawing a new mask, inverting, and then ended up exporting out that whole clip at ProRes4444 so i could bring it into the other project and use it as needed without crashing/errors.