Can't save files in the Creative Cloud folder with Sync active

This just started happening within the past few weeks. Whenever I save a file within the Creative Cloud directory, or any of it's subdirectories, I get this error:

"Could not save '<filename>' because the file is already in use or was left open by another application."

If I try to save a file in a CC directory using non-Adobe software, I get:

"You don't have permission to modify files in this network location. Contact the administrator per permission to make these changes."

It's been driving me crazy. My initial solution was to save to desktop (or anywhere else on my HD) and drag the file back into the Creative Cloud location. Although that began to frustrate me very quickly. Eventually, I figured out if I pause Creative Cloud's file sync, files will save normally 100% of the time.

So, something happened recently where I can no longer have sync enabled whenever I save a file. What's weirder is this is not about overwriting existing files. I can't use "Save As" to save as new file names either. The exact same message appears, and I usually find a 0 byte TMP file within the CC directory.

So for now, I turn off file sync while working so I can save properly, and resume sync at the end of the day. This never used to be the case though. What happened?