Printing via Network USB print server suddenly not working any more

I have always been able to print with my USB
printers connected through a small, pocket-sized Keyspan USB Print server, Model US-4A, very easily and seamlessly, - until the very latest update to Snow Leopard.
This server is connected to my router and the rest of my in-home Mac network by means of an ethernet port, and it has four USB device ports, 1 each for my various printers and a flatbed scanner. It worked well under OS 10.6 until just now.
Now, all of a sudden, though the server hardware can still easily "see" and connect to
the printers, when I actually hit 'PRINT', then the Mac OS
print dialogues are showing some of the printers as "offline." They show up as 'unavailable' in the dialogue where you choose which printer to print to and the print dialogue boxes show the print jobs cused but then report - 'printer offline'
When I bypass the print server - and connect the same
printers directly to the Mac's USB ports, they print fine.
It suits my setup to be able to continue printing via the print server, however, and I am wondering what sort of new issue could now begin fooling the MAC OS into thinking printers are not connected when it has had no trouble with the same print server and exactly the same physical connections previously ?
I've already tried 'deleting' and uninstalling the printers and then reinstalling, and this attempted fix does not work.
Any suggestions here ? Is this a known issue with 10.6.3 ?
What has happened to suddenly bring this about ? Any ideas ?

It appears that 10.6.4 has essentially broken the US-4A usb server. Keyspan's (now Tripp-Lite) response is that the latest driver is for 10.5.x and Snow-Leopard is still not supported. (1 year after 10.6.0 was released to the public). In fact, their response is that they do not even know if they will continue to produce the US-4A. Note that the U2S-2A (2 port USB 2.0) server does not support 10.6 either. Shame on Tripp-Lite for continuing to advertise, and sell a product that does not work with the current version of OS X.

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Printing via Network USB print server suddenly not working any more

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