Ive never had this issue with the model browser before I can't click anything in the model browser I just got a new computer if that has anything to do with it
This is caused by game files being corrupt or missing. To fix this, close all applications using TF2 content (Hammer, CompilePal, GCFScape, etc), then go to Steam->right-click Team Fortress 2 in the game library on the left->Properties->Local Files->Verify integrity of game cache. This will replace any missing or corrupt files.
I sometimes have that i open the browser, i see the menu work fine, but i cant click anything aswel. But i only have to reopen the model browser in that case and not hammer.
If this is your first time logging in after the migration (Feb 8, 2022), you must reset your password to log in. Follow this guide if you're having trouble