Well, that debug-option really f.&$#/"%#&%..ed up my localhost easy 2 installation...
Upgrading to 277 seemed to go fine, except there was an error message when running the install. And when I afterwords opened the module, the debug-mode was still on, and it was not possible to click on the "debug off" button. The button was there, but it wasn´t clickable.
I decided to plunge into unknown territory
I opened the javascript debug config file in Dreamweaver, and toggled the debug mode there, but without improvement. And I made sure I left the file in it´s original state afterwards
I then opened phpAdmin and deleted all easy 2 gallery files
hoping that a fresh install would make life happy again
This turned out not to be the case, so I guess I´ll have to reinstall MODx again...
My gut-feeling is that the initial RC2 did have some significant errors in it, and that the debug function definitely is one of them.
I´ll keep my fingers crossed for the updates
8)