Nope.
Important:
Please disable ALL addons or functions of addons that suppress error messages so you see if any error message happens (e.g. Bug Eater, NoThankYou or any addons like this)
I guess you got any UI error message in the settings menu but it was suppressed. The behaviour would be something like this then until you do a /reloadui!
Maybe also download and activate LibDebugLogger and DebugLogViewer to see the error messages even after a reloadui in the DebugLogViewer ui! It can help to track such error messages if any addon supresses them.
Try the same then again as you got this problem and see if you are able to rebuild it.
If it started with Research Assistant check which libraries are in the dependency list.
Check your other addons then which might have been enabled as well as you have enabled THESE libraries (addons dependent on the same libraries).
And then test if it's about those addons somehow by disabling one after another, do a reloadui, until you notice the same problem/not anymore.
Maybe one of these addons is using any outdated/old version of LibAddonMenu-2.0 embedded into the folder/subfolder "libs" of the addon.
Strip it, change the txt file of this addon to ## DependsOn: LibAddonMenu-2.0>=31 and install LAM directly into your /live/addons folder.
This should make it load the newest LAM version and not any old embedded one.
There can be several old addons using these embedded libs
So search your /live/addons/ folders and subfolders (most of the time the subfolder containing the libs is called libs) for any LibAddonMenu-2.0 or other library which can be also downloaded via Minion, check if a txt file is included in the downloaded zip file, and if so:
Strip this old libs from the addons subfolders and change these addons txt files like described above (use ## DependsOn: <DownloadedLibrarysTXTName e.g. LibResearch or LibAddonMenu-2.0>) + inform the author to not include old version of libraries anymore please.