You can tell Pronterface to show more GCODE output,
there is a "Debug G-code" option in the settings menu.
It looks like the printer wants to print, but waits for something.
Do you have a M109, M116 or M190 in your GCODE file?
M109 = Set extruder heater temperature and wait
M116 = Wait for all temperatures to reach set values
M190 = Wait for bed temperature to reach target temp
If you don't see those codes, can you post your file or the first 100 lines?
there is a "Debug G-code" option in the settings menu.
It looks like the printer wants to print, but waits for something.
Do you have a M109, M116 or M190 in your GCODE file?
M109 = Set extruder heater temperature and wait
M116 = Wait for all temperatures to reach set values
M190 = Wait for bed temperature to reach target temp
If you don't see those codes, can you post your file or the first 100 lines?