On a menupage is a Trigger and a TextTigger. The initial text value for the TextTrigger is 'm0'. You can not move the cursor to the TextTrigger; it stays on the Trigger.
HEADM adc 2 2 adc-null adc-null Empty Empty 1 menupage-obj ;=0,25,100,0
TRIGGER increment increment increment ;=175,25,100,0
TEXTTRIGGER texttrigger 10 0 m0 m1 m2 m3 m4 m5 m6 m7 m8 m9 ;=175,150,100,0
MENUPAGE menupage menupage menupage 2 increment-obj texttrigger-obj ;=500,75,100,0
Changing the initial text value of the TextTrigger to include at least 2 alpha characters fixes the navigation problem ('mm0').