I've been scanning to my computer w/ my cannon mp240 and suddenly cannot. It still scans and prints and prints from my computer, but the scanning to computer has stopped. I have a MAC and it's worked beautifully until now.

The printer drivers for the MP240 are intergrated in the Mac OS X.
If software for your printer was included with the Mac OS X installation, check the printer manufacturer's website for updated versions. Install a printer driver available from the manufacturer's website only if it is a newer version than the one included with Mac OS X.

Repair disk permissions

Tip: For more information about Repair Disk Permissions and Mac OS X v10.2, v10.3 or later, see "About Disk Utility's Repair Disk Permissions feature".

• Mac OS X v10.3 or later: Open Disk Utility (/Applications/Utilities/). Select your Mac OS X startup volume in the column to the left of the Disk Utility window, then click the Repair Disk Permissions button.
• Mac OS X v10.2 through 10.2.8: Open Disk Utility (/Applications/Utilities/). Select your Mac OS X startup volume in the column to the left of the Disk Utility window, then click the First Aid tab. Click the Repair Disk Permissions button.
• Mac OS X v10.1.5: Update to Mac OS X 10.1.5 if you have not already, then use the Repair Privileges Utility. See "Mac OS X: About the Repair Privileges Utility 1.1".