Thanks for the replies.
When I checked here last night after the Calibre update removed the plug-in icon, I read that an update would be made public in a few hours.
When I checked the plug-ins earlier and saw the update listed, I tried to apply it, got the message I posted, then a pop-up saying the plug-in would be un-installed.
I assumed the un-install had been done and did not realise this had to be done manually.
I have now un-installed, restarted, re-installed and created a cover.
It works fine, but I cannot use the font I had used for all my covers up to now, as it is no longer listed...
Last edited by BaconButty; 11-03-2012 at 08:04 AM.