Disregard Window Explorer box.
The problem occurs with all configurations of display states and Link Display States to Configurations.
Also I am unable to right click configurations and Add Configuration...
These problems are specific to this assembly and just started happening, my other assemblies are still working normally.
Regards,
Dylan
Opened a subassembly of that assembly that was not able to create a New Motion Study then closed the subassembly and chose not to save changes to that subassembly. Then when I switched back over to the assembly that was having problems, the problem was no longer there.
Why that worked would be interesting to know or if there's a more surefire way to solve this problem in the future that'd be great. The problem has been solved though. Something about posting to this forum solves problems haha.