Glad to be of service Eric!
Considering it appears that you just installed the software for your Canon,
as of 03/24/2011 Canon released a new driver update for your MF4570dn Driver Update for Mac OS X 10.6
So run this update and try to perform a scan.
If you cannot scan, then I recommend you take a quick view in your owner's manual for your Canon MF4570dn, on Canon's website for your printer,
in regards XXXXX XXXXX Scan feature, it shows :
|Scanner Type||Color Contact Image Sensor (CIS) |
|Max. Resolutions||Optical:Up to 600 x 600 dpi |
Interpolated:9600 x 9600 dpi
|Scanner Features||Rotate, Push Scan (Scan to PC), Pull Scan |
|Color Depth||24-bit |
|File Format||Hi-Compression PDF, Search able PDF, PDF, JPEG, TIFF, BMP2|
And for what I have been able to access so far, the Scanner seems to be more geared toward PC use with the Canon TWAIN Driver ( the driver software that drives the scanner portion of your printer) for the MF4570dn, than for both PC and Mac.
So let me know how that driver update and attempt to scan works.
I will be here awaiting your reply.