Good morning:

We just started experiencing theme issues with our site around the same time that the currently ongoing maintenance started.  Specifically, the only theme of ours that's usable is the "Light" theme while the others are effectively broken.

Any assistance would be greatly appreciated!

We're experiencing similar theme issues that started around the time maintenance started. Is this a widespread issue?

Yes, this is part of the maintenance. It should be quick but some individual communities, it may last longer. Once the maintenance window closes, if you're still having issues, please let us know. 

https://status.invisioncommunity.com/

The issue has been resolved for my site.

Thank you very much!