So as if stands there are a few issues, whether they are known or not that are troubling and rather than making numerous threads for each issue I'm just going to label each issue I have noticed here.

SDK related:
-The Knife template MaterialInstanceConstant 'Reflection Ammount (Masked Areas)' is set to 15 by default which is way too high. The blade comes out as pure white.
-If you open certain weapon MaterialInstanceConstant's (such as the ADS) then the file is marked as dirty and breaks the weapon completely if saved.

Workshop related:
-When uploading an item to the workshop if symbols such as ~ or / are used in the title or description then the uploading will give an "invalid" error message before canceling out.
-Visibility options are broke, Public sets to hidden, Friends only sets to public, Hidden sets to friends only.
-Having a preview image that is either too big in file size or resolution cancels the upload. I imagine a warning message is all that is really needed here.

Anything else I find I will update the title notifying.