Loope said:
Yes she can use them just fine to print. Ask all the questions you want, I'll give you every answer i know. I don't think that it is a driver issue, only because you do not even have to have the drivers installed to access the scanner function via web app, runs in a Java box, and it works just fine. We have other employees that are not set up to print to those printers because of closer B&W network printers, but still save the IP address for scanning purposes.
I apologise for the late reply as I have been working on some coursework. If you haven't solved your problem already then you may want to look into the java installed on the machine with the problem. Possibly complete a re-installation or system restore to a time when the scanning succeeded. Since printing works fine over a network then this tells me that the network configuration between the printer and client is established. The only other variable on a machine that could cause an issue is with the java which you have just stated.

Hope This Helps,
Josh