Strange, CRT issue seems odd to say the least.Uninstall the Canon software, prior to reloading, assume that you did that and then still got the odd msg. Did you go to Canon's website and look for updates? You didn't mention which operating system that you are using, that might help a bit. As I said, you should look at the Canon site and see if there are updates that might be germane to your OS.
As much as I like the printer, ever since I installed the software I get a message saying (in part) "CRT not initialized". Click OK and just get on with printing only for the message to reappear later. I have been in touch with Canon who just say it is nothing to do with them. Thanks Canon. Never had this problem with my other two Canon machines but know from my Googling that lots of others have had the same with various Canon printers. Problem is, I haven't found the answer. Have uninstalled and reinstalled several times to no avail. Seen and tried a number of suggestions...none of them worked. Driving me nuts. Please help me kind people.