I've been working on this document for hours over the last while with no issues, but today I added a new layer and this issue started happening. I don't know how to describe it... but there's a screenshot attached. This is happening to my text and the white rectangle behind it - the rectangle is set to have no outline but it has a black outline with a cross in the corner. The text appears to have something similar, but the line above is fine. It also displays when I use the AI file in InDesign. I couldn't find the right wording to be able to search for the answer, so I'm hoping someone recognizes this and knows how to fix it.
I have tried looking at both the layer properties and the properties of each object and I can't find anything unexpected or erroneous.
It's a huge file so I deleted everything except the shapes with the issue (to upload.) CPU preview didn't help. I also opened a new file to see if it was in my settings, and the new file didn't have the issue so it's something I did with creating the shapes, I just can't figure out what.
And now it's not letting me upload the file...
"The attachment's [name of file].ai content type (application/postscript) does not match its file extension and has been removed."
I feel like I haven't done anything different than I've ever done in the 10+ years I've been using AI, so I have no clue what is happening.