I would upload a pic showing the problem. But I can't. Seems like I have never been able to. When I try to, I get An error occurred when uploading the image: Forbidden. What's the deal, is it forbidden in all around if so why offer it, or is it just me that's forbidden if so why?
It sounds like the network you are using is blocking Imgur. This is pretty common with "category/tag-based" site filters (I'm not sure what the proper term is).
There may be several reasons why these categories are blocked. Some may include wanting to block the sharing of files, or these categories being a subset of "Social Media". The latter reason is kind of half-true because Imgur can be used that way despite mostly being used for image hosting, though I don't know what anyone would want to do that.
In any case, that seems to be the most likely reason since you are able to access StackExchange but not upload pictures.