I had 2D ST8 on my computer (Laptop no Network)and was getting a few minor issues then The opening page would not respond to mouse commands. I uninstalled and updated to ST9 now it will not open files, raising a dialog box headed 'server busy' saying 'This action cannot be completed because the other program is busy. Choose "switch to" activate the busy program and correct the problem' Switch to opens the windows 10 menu
The other option is retry and does nothing. The only way to escape is end task..
I received some help from the local Solid edge agent and it apprears that in this case simply uninistalling the earlier program was not enough. I uninstalled ST9 again, then cleared Solid edge from the program files and registers, reinstalled ST9 again and it is now opening correctly.