No "Open" dialog
Mac OS Sierra 10.12.6, XD 184.108.40.206
The "Open" menu option is greyed out. Also double clicking on a .xd-file results in the file not being opened by XD allthough focus shifts to XD or the program starts if it was not already started. Only opening documents from the "Open Recent"-menu works.
Is it possible you’re not logged into the Creative Cloud desktop application? You can check by clicking on the … menu in the upper right hand corner.
If you are, you should force quit the CC desktop application (Cmd+Ctrl+Q) and then relaunch again. You should then be able to access the files via File > Open.
Let us know if this works!
The user is able to use the Open-menu now. After logging out of CC, restarting the Mac and logging in again.