Its the character ú
It behaves the same way on my Vista PC with a UK keyboard.
There may be something weird with that combination...check out...
http://lists.frameusers.com/pipermail/framers/2009-January/015383.html
If the default behaviour of the IDE to cntl-U remained as compile & Upload, why would adding the option in your configuration file to change that behaviour to compile Upload+Open monitor be a conflict?
I'm possibly not understanding the technology limitations.
Graham