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User complaining about 2c5 error...

I've got a user complaining that when he tries to use the newest version of my application, he gets an IO Error opening the USB device: e00002c5.

My understanding is that this error means that something else in his system has already grabbed and opened the USB device (a calculator, actually) - but, of course, he says that's not true. He also says that an older version of the app can still connect.

The difference between the old version and the current version is that the new version uses newer versions of the IOUSB*Interfaces:

<    IOUSBDeviceInterface    **device;
<    IOUSBInterfaceInterface190 **interface;

became

>    IOUSBDeviceInterface197    **device;
>     IOUSBInterfaceInterface197 **interface;

Any suggestions on where the problem might be? He is, of course, remote and I can't get to his machine to look at what's going on. He says he's running 10.4.2.
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