.cdr is already open elsewhere

This post is very much helpful and I have also got to know about the .cdr file which can be open in any of system. Setup WiFi Extender

Question is is it something that needs fixing?  It could be due to system specific set up.  What immediately comes to mind is syncing/sharing/back-up software.  Something like dropbox, google drive, or anything that copies files from one location to another, especially to the cloud.  Dropbox has been know to do this when saving files to a dropbox folder.  It basically locks the file while it synchs it.  If you have a dropbox folder on many machines, this could be a long time relatively.  

If you have any such file sharing, back up or back up to cloud software running, try turning it off and see if the problem stops.  If it does, at least you while have isolated the problem.

I'll bite. Ctrl+Alt+Del > Task Manager > Processes/Apps

What I have seen is that Coreldraw is still 'open' in the processes list even though

you 'closed' it. Sometimes you cannot save because of that.

Also, if there are multiple instances and you are working in CD and try to 'end task'

the ones not in use, it can be a gamble so be prepared for it closing out.

Sometimes the active CPU % gives it away.

At least that works for me and rids the problem.

Davis explaination sounds good even though my puters are isolated from

what he has listed, so who knows?