I try to optimize the extruder temperature for a certain type of filament. To do this i created a simple zylindrical object and want to vary the extruder temperature every 5mm in z height. I created processes with different temperatures and ranges of layers. But only the temperature of the first process is used. There is no other M104 (or M109) statement within the gcode. Same effect with heat bed temperature.
Changing other parameters work well. I use multiple processes quite often; that's a very useful feature!