This page will guide you on solving problems related to the in-game repository.
If the in-game repository is showing a persistent ‘Loading..’ text, there are few things that could be happening:
Poor/Bad internet connection
Use of VPN/Proxy influencing the normal functionality of the game’s online features
On some very rare cases, this can be caused by wrongly packed mods. Please disable all mods and check again, and eventually enable the mods until the one causing the issue is found.