Print Jobs: Giving Couple Of Lines Of PCL Commands

This may actually be a Linksys problem, but I hope there's a workaround in Vista. Linksys wireless print server; network of computers (mostly Vista 32, some XP, one Vista 64, one Linux) that print through it to an HP LaserJet 1200 printer using HP PCL 5 drivers. All print jobs are OK, but many of them (somewhat unpredictably) are preceded by a junk page containing a couple of lines of PCL commands ("PJL COMMENT" and the like).

It is not clear whether the junk page is the beginning of the job or the tail end of the previous job -- thus I'm not even sure which computers are generating it. I think the former. That is, I think it is a set of PCL comments sent at the beginning of the job. Linksys drivers are not on the PCs. Instead I print through LPR or RAW protocol (both give the same results) on a TCP/IP port as recommended by Linksys.

I have tried the WinPrint print processor and 2 versions of the HP print rocessor. This seems to slightly change what's on the junk pages but not eliminate them. Printing several jobs in succession from the same computer, I usually don't get junk pages in front of them. But the actual conditions are hard to pin down. Trying to run around and try all the combinations is very tedious