Uninstalling and reinstalling worked for me!
Just wanted to post here that I tried the updates in Mac and that did not fix the problem, so I did the whole uninstall/reinstall thing. It worked!!! Yay!!!! I'm a novice at the inner workings of computers so if I could do it, then it must not be too difficult. At the end of the reinstall, a prompt came up automatically to reinstall my printer/fax/scanner. I have a Photosmart c309a. They did it for me essentially, so I'm a very happy camper now. Thanks for this thread - my husband and I have been baffled by this problem for months now!