*SOLVED*

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When working on assemblies I will sometimes edit a part in the assembly, sometimes I will choose open part through the assembly and edit the part by itself. I do this with many assemblies with no issues, except for one. This assembly has turned completely brown/tan:

All components have their appearances when opened individually and sometimes when opening the assembly a glimpse of the model with all correct appearances will occur only to go brown again once fully loaded. The biggest issue here is that when editing parts within the assembly now, no other parts go transparent. Everything just stays brown and it is making it very difficult to work with.

I've narrowed it down to my station specifically because my co-worker is able to open the assembly with all appearances showing properly.

Solved:

It seems that for some reason when I had this assembly open, I could right click the assembly in the tree and there the appearance was applied to the assembly in this assembly if that makes sense. It was overriding all of the other parts appearances. By deleting that I was able to get the model to act normal again.

I'm not sure why this didn't show up for my co-worker or why it didn't happen with any other assembly. I also don't understand why an appearance assigned to the full assembly would stop the parts I wasn't editing in the assembly from going transparent.

Thanks for the replies.