Another option is:
https://forums.unraid.net/uncookie.php
It'll only remove old IPS cookies that were using '.unraid.net' instead of the more secure 'forums.unraid.net'
One user cleared their browser cache/cookies and the issue was fixed (for them). Awaiting results if it persists but this is one option to try. @jonp is also in a back and forth with Invision support on this. Thank you all for your patience in this annoyance.
https://docs.ibracorp.io/all-guides-in-order/documentation/virtual-unraid
If you would like to try out the Unraid 6.10 RC but don't want to update your production servers just yet, this guide is for you!
Very nice write up from @UnraidDuck
I think I re-enabled what you are wanting based on: https://invisioncommunity.com/forums/topic/462409-46-how-to-restore-custom-member-titles/
Please let me know if this is/isn't it.