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I wanted to mention this as I noticed it was already reported as fixed in release notes for OmniGraffle 5.2.1:

Fixed a bug where a custom keyboard shortcut for showing/hiding Guides would result in an error.
I have assigned Cmd-' to Show/Hide Guides, and every time I use it, I get

-[NSMenu submenuAction:]: unrecognized selector sent to instance 0x920fa0
Is this the same bug?