So I was having the same problem and came here for the solution. I did just install a bunch of mods yesterday and that's when this happened. So, 1 by 1 I deleted and tried to restart. I deleted the module manager and it went back to loading....keep in mind that the module manager was the last mod I uninstalled. There were no more mods after this. Now I am getting a warning that there is no mod manager. I am lost...in space? Any suggestions?