Canon MP495 Scanner not working

Hi all,
I have setup my Canon MP495 all-in-one printer on my iMac and while it is printing fine, the scanner just isn't working. When I go into Print & Fax in the system preferences the Canon MP495 is only displayed under the Printers heading.
So I tried clicked on the + button and my Mac finds a device called Canon MP495 series with a kind of Bonjour Scanner. At this point I thought ah there we go sorted. But once I have clicked on that device and clicked Add. When I open the scanner it just says Trying to open scanner session and gets stuck there.
Does anyone have any ideas as to how I could fix this?
Thanks,
Mike.

Thanks for the suggestion, unfortunately it didn't work.
I noticed that when the printer was plugged in via USB it had 2 tabs when in the Print & Fax section. One said Print and the other said Scan. Where as when the printer is connected via WiFi there are no tabs???
I have uploaded some screenshots:
This one shows the printer setup for use over WiFi (I can print using this one but not scan):
This one shows the same page but after I have plugged the printer in via USB, you will notice the printer has appeared again:
This one shows the settings page for the second printer that appeared (the one connected through USB). You will notice it has the 2 tabs at the top saying Print and Scan:
Anymore suggestions would be greatly appreciated
Thanks.

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