I run into this problem today when re-opening my design. it suddenly show "xDX Designer is in readonly mode" while 1 hour ago i could open the same project without any issue.
In the output console i also get the message "There is no 'intexpflow' license feature available. Project is opened in read-only mode."
I have checked my license setup and there is no issue with it.
Any help on how to solve it is welcome