Shift vs Caps Lock on client keyboard?

[SkyeFire]

So, I've just unpacked and started using my JetKVM yesterday, and it works quite well so far, except for one glaring annoyance -- my client-side SHIFT key does not work. At all -- it's as if the JKVM web page just ignores it entirely. And the CAPS LOCK behaves like SHIFT, rather than normal CL behavior. What's especially odd is that, watching the "KEYS" indicator in the lower-left corner of the JKVM web page, I can see CAPS LOCK flicker when I hit CL, and every other key I try appears to work properly, but SHIFT generates nothing at all.

For various reasons, this is making logins and entering decrypt keys extremely hard. I can enter them using the virtual keyboard, but that's extremely painful compared to just touch-typing.

Has this happened to anyone else? I did go through the settings, but there doesn't seem to be anything for keyboard configuration. My host and client machines are all running US standard 101-key keyboard configs, with no oddities like StickyKeys or key remapping.