I just found a similar issue to this, dealing with the Canon LBP3370.
I also notice that Canon Europe seem to have removed all trace of any MacOSX drivers from the support page for this printer.
I have an 'early' MBP running 10.6.6 w/ Suitcase3, QXP8.5 and CS5.
Just bought a MacMini updated to 10.6.7. Same software. Same files. Same fonts.
I have one file which gets printed weekly from a template in QXP. It prints fine on the MBP on a Canon LBP3370 using the last 'auto updated' driver. Not sure how to check the version number of the driver, but it works. I looked in 'About this Mac' and looked up the printer, and it says driver version is 2.0 - then again, it says the same for the version on the MacMini, which was installed today using an installer marked 2.24.
On the MacMini, the same file, on the same software yields an output error to the printer and requests the printer be switched to 'raster' mode in 'Quality' settings in order to print, which I understand yields diminished quality on more complex files.
I experimented with the file, removing elements and isolating them in another document to test if they print OK on the MacMini. 99% of all the page elements print just fine including a complex EPS without switching to 'raster' mode. All except for... wait for it... a SINGLE weight of the Adobe Helvetica Neue LT Std OpenType font. The document has about seven separate weights of the same font in use, and it is only one of them that triggers this problem.
I've scanned the font completely for errors and corruption and it gets a clean bill of health. The exact same font, on the MBP, using the same software and the same printer, but used on 10.6.6 prints perfectly without having to switch to raster mode.
Bizarre.
What actually is the difference between UFR and Raster modes anyway?
I notice a lot of people seem to be having issues with OpenType fonts since 10.6.7...