I recently upgraded to Sketchup 2018. It works great on newly created files, even very large complex files.
Any files created in 2017 version or older open with the saved view visible but the window is locked and inoperative. All other programs such as outlook or photoshop still work correctly while the sketchup window is locked. The locked Sketchup window can only be closed when forced to close using the windows task manager.
I have tried running the program as administrator, my IT helpdesk has uninstalled and reinstalled the software with the same results. They are stumped.
It appears that having two versions is no longer allowed, when 2017 was added back to my programs the notice came up that the license was expired.
Sketchup Make is not an option, the free version is now 2017 and when loaded it defaults to Pro and indicates the 2017 license has expired.