This is the suggestion I got on the HP forum. Do I dare try it?
If you are willing, I would like to try a new approach. If we, disconnect the USB cable, uninstall all of the HP software, remove the HP update that came through via the Apple Software Update and then restart the computer. I want to see if the printer will print with out hanging without the software. This will help me determine and ultimately resolve the issue.
If you are up to the task, use the instructions below.
Disconnect the Printer USB cable
Scrub/ Uninstall
Open the Applications folder > HP or Hewlett Packard folder > HP Uninstaller
Click continue, click on one of the printers in the list.
* Only do this step if you do not have any other HP Printers. Hold down Control, Option and Command, While holding the three buttons down,
Click uninstall.
Reset Printing System
Click the Apple icon ( ), and then click System Preferences.
In the Hardware section, click Print & Fax/Scan. The Print & Fax/Scan dialog box opens.
Right-click (or Ctrl +click) in the left panel, and then click Reset printing system…
Click OK to confirm the reset.
Type the correct Name and Password.
Click OK to reset the printing system. The Print & Fax dialog box shows no printer selected
Note: This will remove all printers in the print and Fax/Scan, any printer removed can be re-added later by clicking the plus (+) symbol.
Repair Disk Permissions
On the Dock, click Applications, and then click Utilities.
Double-clickDisk Utility.
Highlight your hard drive/partition on the left (by default this is "Macintosh HD").
Click the Repair Disk Permissions button at the bottom of the window.
Once the repair is complete, restart the computer.
Restart the printer.
Now we can plug USB cable back in and the driver will automatically install. Try to print now and let me know what happens. I am eager to see this resolved.