I ran into this tonight at 11:06 pm it's now 1:14 am and I figured out what is causing it but not how to resolve or fix it. I go to save and get the message 'An unknown error has occurred.' I tried to save as. Same thing happened. Copied artwork out into new file. Same thing happened. Tried to rebuild file and same thing happened. I selected all my paths which had a graphic style applied to them and make them no fill no stroke, than just manually colored the stroke instead of using my graphic style and the file saved and didn't give me the error. So I tried all my other graphic styles (Which I've been using for years just fine) and even if it wasn't the new style but my old dependable ones the file would error out and not save. So I think Graphic Styles has become corrupt? I think? I don't know, I can't get any Adobe engineer to help me. The moderators on the forum won't be able to address it, it's clearly a new bug. I'm using 21.0.0 CC 2017. So now I can't use Graphic Styles, great. And I pay for this type of creative experience. Wonderful. I've wasted three hours tonight, at my studio rate that is six months CC subscription I should get comped by Adobe. Hell they don't even pay their beta testers and I isolated the problem for them. Here endeth my rant.
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