Unable to create collections or sets

Im running LRC13.1.  On my main day to day catalogue i can create collections as normal.

BUT i just created a new catalogue with the aim of merging several older ones together.  On this one im completely unable to create collections, collection sets or smart collections.  Click the add collection box and simply nothing happens at all, from the collection side panel or the main menu.

Ive tried optimising, closing and reloading etc but the same issue persists.

Oddly if after failing i go to "import from catalogue" on the menu, after a few seconds the create collection box DOES popup and works but obviously this isnt really a fix or workaround.

Anyone have a fix for this problem because currently this new catalogue is effectively unusable due to the issue.

LRC13.1, Windows 11 etc.

- Problem:- click "Create Collection".  Nothing happens

- Expected result: Popup dialogue box allowing it to be created.  Actual result - nothing happens.