Running Macbook Pro 10.9.5 with Canon MX452 on wirelss. Ink up to date; I printed an email, but other items just sit there for HOURS. This is new. been working fine.
THis seemed to happen when ink was showing low.Canon MX452 is a popular printer.
Do you have other printers or things that use it?
Wireless connections have the potential to fail due to unseen factors.
Still, if the printer is within a few meters(yards) of the wireless router, there should be no problem.
Can you do a direct connection with USB?
If it is still under warranty, you may wish to consider a RETURN. Substitution is the most effective way to troubleshoot this kind of problem.

Geek after dark, thanx, but still no go. I have quit and unplugged - downloaded a new copy of driver; restarted the computer; printer is same locale as computer, which reads WiFi fine. I did connect directly after your suggestion. I keep getting "Printer is in use", and the scale shows quarter INCH of blue then sits there.So if it is not a Wi-Fi issue, then you think it is the ink agreement.
So the next logical step is to try new ink and see if that helps.
Ink management problems have been documented with many printers. It seems the manufacturers  want you to buy ink even when is is not needed.
Here is a very interesting news release from Epson.
Epson showcases latest Ink Tank System printers in the UAE
Reading the article you will see that it is an admission that the in system needed some work.  Of course, the spin is to put the blame on OTHERS. Yet they admit a better design is better for all. They don't specify the fault of the old design.

If you find that the ink management is stopping the printer, look for a workaround using refilled ink cartridges. The people who do refilling KNOW how to disable that ink management thing.
Hope that helps some. 

Here is an old reference:
Stink over ink cartridgesSorry, I did not mention 2 brand new ink cartridges. I have been refilling my  own for some time, but opted for new ones.As mentioned, there  was a lot of rant about this awkhile back.
http://www.fixyourownprinter.com/forums/printer/33219
HP Business Inkjet 2300 - Bypass INK EMPTY message!!!! Ink refills...
The above website has more info about how the big printers companies want to suck money from your wallet.
Quote

HP designed this chip on the cartridge that counts the days till death, or expiration. The empty cartridge death, which halts printing operations is when the fluid runs dry. It seems reasonable enough to understand it should stop but, if you refill it like I did then you have a problem if the printer thinks it's still empty. It won't let you print until you replace the cartridge with a brand new expensive cartridge. I REFUSE to pay those prices. SO, what I did is this: I worked for hours to find this resolve so I hope you all appreciate it! :-)