Hi! Thanks for reporting this.
Since this looks like Windows is marking the app as "not responding" (freezing the main window loop while some background processes might still run), i would love to get a few more details to pinpoint the bug.
- How often does this happen? (e.g., every few minutes, once an hour, randomly?)
- When the black box appears, does the pet keep physically moving/walking across your desktop, or does it stay in one place just playing its animations?
- Does the issue resolve itself if you wait a bit, or are you forced to close the app every time?
- Does this only happen with this specific Ferret and custom colors, or does it also happen with other pets and default colors?
Any details would be very helpful to replicate this bug and try to solve it!