The mask and overlay of Applied Icon Packs are not sticking. Many seemingly unrelated changes will cause these to revert to default.

Here is just one example:

1. Go to My Drawer.

2. Add a folder.

3. Go to Settings and apply an icon pack that has a mask and overlay. (Download and use Rusticons from the Play Store. This pack has obvious mask and overlay.)

4. Back out of settings and see that icons have changed along with the mask and overlay of the folder.

5. Go to Settings > Folders Window and change the font size of the title.

6. Back out of settings and see that the mask and overlay of icons and folders has reverted to default.