I seem to remember that the Ithaca had issues with their OPOS drivers. You might want to contact them and ask for the latest version.
Another thing you might try is to install the Ithaca Windows printer drivers and see if everything prints OK. If so, then install the OPOS drivers, but just for the cash drawer. Do it one at a time to see where/if the issue returns.
FWIW, we do this with Star Micronics printers all the time, Windows driver for the printer and their OPOS drawer drivers when using serial/USB drawers
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I am attempting to install a couple of Ithaca PosJet 100 printers. I
get<BR>> install done, but when starting POS, I get an "Warning
920 Failure was<BR>> detected in the printer opos drivers"
Deleted drivers, re-installed. The<BR>> printers are attached
to LPT1, and the cash drawer is in serial with the<BR>>
printer. In other words, the drawer is cabled to the computer and the<BR>>
printer<BR>> is then cabled to the drawer. Could this be the
problem?<BR>> <BR>> Bud<BR>>
--<BR>> If we can''''t pet it, you don''''t want