After I repair permissions via Disk Utility, my HP1012 doesn't work. I get a message that permissions have to be repaired and do I want to do so. Yes, then it works again.

Annoying, but not serious

I'm not sure of the value of this, but it won't take long to try and might help. Have you tried repairing disk permissions whilst booted from the Recovery HD rather than whilst you are normally booted.
Restart holding down Command + r and from the screen with four choices select Disk Utility. Choose it and repair disk permissions. Restart as normal from the Apple menu and test.
If that doesn't help, try once again resetting the printing system, but before adding the printer back in go to Macintosh HD>Library>Printers and move the HP folder to the desktop. Log out and back in again (or restart) and try to set up the printer afresh. Hopefully this will initiate a fresh install of the software. If this solves it you can trash the HP folder on your desktop.

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