Idle Photoshop creating heavy network traffic

We are running Photoshop CS on XP 3.2 GHz and 2 GB of ram, and the scratch disk is an extra drive in the same box. I recently noticed that on one machine, when Photoshop is loaded, sitting idle with no files open, it is sending/receiving a huge amount of traffic over our network. NetPerSec shows it to be sending/receiving an average of 2 Mbits/sec. Closing Photoshop makes it drop to nothing. Also, when I just click on the Photoshop desktop, or open a dialog box, the traffic stops. I noticed this once before, about a month ago, and a restart seemed to clear it up. That hasn't worked this time. Also, we have multi-licenses of Photoshop loaded on other machines, and are not seeing this on any of the other computers (all the same computer set up).

I don't see any auto check for updates that would be causing this traffic, does any one have any ideas? Apart from making Photoshop drag when I'm trying to use it, it is a bit worrisome to see such heavy transfers from an idle application. I don't see this with InDesign or Illustrator.

Thanks in advance,
Jim

is your default printer a networked printer? maybe offline?

Even the update check will only send a few bytes about once a month.

It could be a network printer, or some other driver on your machine, or it could be another virus...

Haven't found any virus or spyware as of this morning, it may be one of our network printers. I just learned we upgraded drivers over the weekend, which ties in with the time I started seeing the traffic on Monday. Will have to look into that.

Thanks...

set up a local printer as windows default and see if the problem goes away.

Setting a local printer to default didn't change anything. It seems odd that it is just occuring on this one machine of ours, and not the other boxes running the same set up. Also, when I actually printed from Photoshop to our Xerox Doc 12, NetPerSec actually showed a decrease in the network activity. As soon as the file was sent, it jumped back up.

Now it seems to have dropped to 15-20 kbits/s from the 2 Gbits/s it has been running at all week. Very strange.

strange indeed.