Ingenico 6550 won't display signature box

I'd call Ingenico's tech support, but I don't have a month to wait for their callback.

Our app uses the 6550 and it displays all the forms just fine except, on one machine it's not showing the signature box on the signature capture form. It shows the buttons and text just fine.

I've tried using our app, I've tried the Ingenico test app. Everything seems to check out fine. The only thing I get in th log is this:

2/17/2011 8:43:33 AM (31813 ms) EC0000 Device name [Ing6XXX] - UPOS-Interface-App error code=0xFD

开发者_运维知识库It's followed by these lines after I dismiss the form:

2/17/2011 8:43:33 AM (31860 ms) EC0000 Device name [Ing6XXX] - Last platform error code from device=0x2, desc=SingleButtonEntry: ssaSecFuncKe

2/17/2011 8:43:33 AM (31860 ms) EC0111 Device name [Ing6XXX] - SIG - Direct IO - Command 12 - Invalid command, or function code missing. Length 5 [Package {00 05 95 FD 6D}] [Translation {iDataLength 0}{ucFunctionCode 95}{ucResponseCode FD}{ucResultCode 6D}{sData }]

2/17/2011 8:43:33 AM (31860 ms) EC0111 Device name [Ing6XXX] - SO APP - Direct IO - Command 12 - Invalid command, or function code missing. Length 5 [Package {00 05 95 FD 6D}] [Translation {iDataLength 0}{ucFunctionCode 95}{ucResponseCode FD}{ucResultCode 6D}{sData }]

I'm not sure if that's related. Does anyone have experience with these things. Any idea what might cause the failure to display the signature box?

The problem turned out to be a missing registry setting for the form location. Not sure how we missed that.