Printer won't duplex. It did before and still does on my PC.

My Canon IP4200 and IP4300 won't print in duplex model and there is no menu item or list box that lets me control it. It used to duplex under OS X 3 and stil does on my PC. I have the latest drivers installed.

Have you asked Canon? They write the drivers. Apple just distributes them.
Do you have the printing details showing? If there is a button that says "Show Details," click it.
Are the options there, now?
While you have the most current drivers, are you sure it is set up to use them. Sometimes, you can get a generic driver or a Gutenprint driver selected instead of the Canon driver.
Are the options shown in this help article not available on your print dialog (it's old, but the options should be mostly similar)?
http://www.usa.canon.com/cusa/support/consumer/printers_multifunction/pixma_ip_s eries/pixma_ip4200?CMD=MIXED_SEARCH&mName=PIXMA+iP4200&mType=PIXMA+iP&pageKeyCod e=ekbresults&searchString=duplex+printing+on+Mountain+Lion&BASIC_SEARCH_CURRENT_ TOPIC_ID=1362&BASIC_SEARCH_CURRENT_TOPIC_TYPE=0&RESULTS=RELEVANCE&RELEVANCE_STAR T=1&RELEVANCE_COUNT=25&CONFIGURATION=1011&PARTITION_ID=1&TIMEZONE_OFFSET=null&US ERTYPE=1&isSecure=false
Do you have one of the appropriate page sizes selected (as indicated in that article)?

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