Describe the bug
After installing and opening WebTools-NG and signing into Plex, you are presented with an error message (see below).

1. Downloads, on one occasion it failed to add items to the queue. I tried repeatedly with mixed results, but seems to work now.
2. Edit a Custom Level, the Available fields list does not always display. The text appears and disappears making it hard to actually do anything.

To Reproduce
Steps to reproduce the behavior:

1. Open WebTools-NG and sign in, error message pops up.
2. Go to Download and add items to the queue
3. Click on show queue and observe no items.
4. Edit a Custom Level
5. Watch the text appear and disappear at random intervals. Moving the mouse around seems to effect the display of the text.

Expected behavior
Expect no error message, expect items to be added to queue, expect to be able to read Available fields list.

Screenshots

Desktop (please complete the following information):

• OS: Mac OS Monterey, Big Sur and Mojave in Virtual Box VM's.

All of the above OS were tested, all showed the same issues with WebTools-NG v1.2.0 and v1.2.1 Beta.

Additional context
These issues may simply be the result of running Mac OS in a VM, but worth looking into if possible.

Maybe ask some owners of real Mac's in the Plex forums, if they see the same issues?

Logs
WebTools-NG.zip