CUPS won't allow printing in a Windows network

Question

I just spent five days trying to get printing working in my OSX 10.9.2 (iMac). Here's the thing: the printing network is a Windows smb network. Everything works fine on my MacBook OSX 10.9.2. I can manually install the smb://xxxx/yy printer and it works just fine there. So what's wrong with my iMac? I have no idea, but this is what happened. First I tried installing through Printers & Scanners / Advanced. And it worked fine on OSX 10.9. I used guest/guest credentials for the Windows network printer when asked.
But after upgrading to 10.9.2 it stopped working. The queue window says Ready to print and refresh or Resume does nothing. In the error log it says "ERROR: error in CUPS Filter - : Broken pipe". And also there are possibly problems with authentication.
Then I tried installing the printer through the CUPS web interface. Had weird problems with it, as it's very hard to control users and authentication. At one point I thought I had cracked it, I was able to print with my Windows network credentials. But the next print did not work anymore. I had to uninstall the printer and install again to get just one print. After trying to set users right with different sudo commands I am now at point where I can't even get one print through.
What can I try? I have done Reset many times from Printers & Scanners, no difference. What does the broken pipe mean? And how to set the printing CUPS user to what I want (it needs to be different than my OSX user or "root")?

Answer 1

Launch the Console application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Console in the icon grid.
Select
/var/log ▹ cups ▹ error_log
from the hierarchical list on the left side of the Console window. If you don't see that list, select
View ▹ Show Log List
from the menu bar. Then select the messages from the time of the last failed printing attempt. Copy them to the Clipboard by pressing the key combination command-C. Paste into a reply to this message (command-V).
If there are runs of repeated messages, post only one example of each. Don’t post many repetitions of the same message.
When posting a log extract, be selective. In most cases, a few dozen lines are more than enough.
Please do not indiscriminately dump thousands of lines from the log into this discussion.