Ian it is a deliberate operation of the OS, not a glitch. That is how Korg designed it to work!!
The question has been asked, and WELL in advance of the latest OS even being announced as coming. But like the markers, these requests fell on deaf ears I'm afraid!
Some folks don't have an issue with it, but as I tend to use an arranger in very limited "combo" (ie 3 instruments including me) fashion and using full keyboard, I always found it awkward at best without the EC-5...
I just feel it could have been done better...much the same as the midi markers could be more like Roland and Yamaha and have dedicated selection buttons on the panel...
Dennis