PROBLEM SOLVED.
Im replying to myself here because there is no support on Adobe products. As good as 'community' help maybe it has been totally unhelpful on this issue. There does not seem to tbe any support by Adobe staff which is very disappointing.
Tthe issue with Acrobat got worse over a period of many months.
Odd error messages like Acrobat closed unexpectedly when it hadn't. Unexpected Internal errors, and maybe a few more.
Although I can't be absolutely certain its caused by CANVA only, I am fairly sure that the preferences were being over written when opening files created by CANVA. I know for a fact that the colour profile settings were being changed. I only found this out when working on clients files, getting them to proof it and they mentioned the colour had changed. Trying to figure out what was going on I noticed that colour management preferences had changed and when I change them back opening a canvas file would change them back again. CANVA has some explaining to do maybe.
Acrobat was at least functioning... until very recently the user interface because totally dysfunctional. Opening a file directly resulted in an internal error message. Opening Acrobat left me with a blank window.
I got in touch with an Acrobat representative via Twitter now known as X. They suggested I delete the preferences folder. This I did with absolutely no change. The issue was exactly the same.
The suggestion however prompted me to go hunting for old Acrobat files.
I uninstalled Acrobat, cleared the registry with CCleaner, restarted the computer. Cleared registry again.
Then I went hunting for Acrobat files on my hard drive. There were still many files in all kinds of places. I deleted them all and anything that vaguely looked like it was related.
Clear the registry again, restart, clear the registry again.
Reinstalled Acrobat.
The problem is now fixed
All the little error messages have now stopped as well. It's early days I have no idea if this is going to last but right now it's running extremely well
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