Why does Cmd+\ stop working?

I've been having trouble where a keyboard shortcut in an app - Cmd+\ - gets not response. Or rather it does work on first booting but at some point it stops working. The first thought was another app was grabbing the shortcut association, but I can't find any sign of that.
By chance, with the keyboard viewer left open, I noticed that on initial boot the viewer registers both the Cmd and \ keypresses. When the shortcut stops working, the viewer shows - for the same keypress combo - that only the Cmd key is registered as down in the viewer. Interesting!
This is happening on a Sping 2011 unibody MacBookPro (v8,2, Core i7 2.2GHz, 8 Gb RAM, not under heavy load). I have an external extended keyboard (for numberpad use) usually attached via the USB port on an external Apple 27" display. Anyway, the change in key registration is the same in the keyboard viewer whether I use the external keyboard (also if plugged directly into the MBP's USB  port) or the MacBook Pro's own keypad.
Uaccessibility settings were mooted as a cause. Checking, I've  'enable access for assitive devices' and screen zoom set 'on'. Disabling either/both of these has no effect.
Both Cmd and \ keys work fine on their own.
Might this be a hardware fault or am I somehow triggering some obscure setting.

Good spot. Yes, it does turn out to be 1Password, in a roundabout way. Odd how that shortcut didn't show up even in things like KeyCue, but it is a shortcut for a Safari Extension so may be less 'visibile' to shortcut-sniffing utilities than normal apps.
Acting on your tip, I visisted 1Password and got to here: http://help.agilebits.com/1Password3/keyboard_shortcuts.html. I nixed their 'Fill Login' shortcut - which thankfully I don't use. After that Tinderbox worked well.
The shortcut is set via 1Password's setting and  - I think - affects the plug-in is all browsers (or if used only work with Safari). I have the 1P extension in Safari/Firefox/Chrome here having altered the 1P preferences all seems well.
The really weird bit was how, when running, the iP extension shortcut suppressed the '\' in a 'Cmd+\' keypress. Very odd.
FWIW, I stumbled on this as I also use Eastgate's Tinderbox daily and that has Cmd+\ hard mapped to a much-used dialog. the only possible fix short of not using one app or the other was to remove or alter the shortcut for the 1P browser extension.
Thanks again,
Mark

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