We are working on finding a fix for this issue.
Adobe InDesign team
An error occurred while saving the commentAnonymous commented
The issue has not been fixed, BUT it seems to mostly happen to me AFTER I use the File/Package feature. If I open the file after that I start to get folders with the same name (but only with the "Document" fonts inside) and keeps duplicating every time I open the same file until I quit Indesign. If I open the Indesign file inside that packaged (or any packaged folder) I get the same fonts issues (messages that avenir or other fonts won't work unless I do multiple re-opens) Consequently, I am not packaging files (which is NOT optimal in my work). Oddly, it does somewhat seem to resolve if I delete the fonts folder inside the packaged file. At any rate, it's NOT fixed in 15:03