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Any conversion requires to save the document, even if you make no changes. And if you open a file from any previous version it will be opened as a converted document (which was formerly seen in dashes, but now it is not the case anymore). So you have to save it now in the current version.
These documents were made in CC 2018, no conversion. Like I said, even a brand new document with nothing in it acts like I've made changes as soon as I open it
This even applies to brand new documents with nothing in it.
Are you saying the after you choose File > New > Document, the asterisk is visible next to Untitled-X.indd on the tab bar? Did you try trashing preferences?
I mean after saving and closing the new document, the asterisk appears after I reopen it. I'll try trashing the preferences when I get into work tomorrow. Thanks!