Recent Gmod updates have been problematic with our release version and to be quite honest, I'm surprised ULib initialization may work at all.
However, to my knowledge, our menu's don't have a 'loading' function but it is possible this is a derma function I'm not familiar with.
Are you running other mods? Have you tried removing them temporarily and restarted the server?
Megiddo/Stickly Man/Jay, any input on this? With the new engine updates to Gmod, can we even really support release version?
Would the loading be coming from our menus?
Also lilneo, no need to sign your posts. We know who you are.