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I have a usb hid device under development.
When I send a report with WriteFile() (Win32) only every other report is received. WriteFile returns report len + 1 in the lpNumberOfBytesWritten parameter, which is correct (+1 for the report id, which I set to zero).
I am 99% sure its not a device issue.

Any ideas why only every other report gets through?

The device has an interupt out end point, so this end point in being used, not ep0.
Updated 16-Aug-12 3:56am

Can really tell unless you show us some code. Perhaps youll find something useful in these articles:[^][^]

Good luck :)
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Thanks Kenneth, I am having second thoughts about it not being the device.
Snoopy shows the packets going out.
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