Since my last post, I finally did hear back from Daniel at Zaon on 2/4/2009 - roughly three and a half weeks after e-mail him to tell him I was still having the problem with my XRX after they applied their "fix". His reply was:

"Part of the problem is that we have not been able to recreate the issue you are describing."

In an e-mail from Zaon in November 2008 they stated:

"Yes we believe we have found the issue, and have a fix for it, just send your XRX in and we will take care of it."

So it appears Zaon is now saying they no longer the cause of the issue?

Anyone else had any success - or updates on their story?