I think these lines are missing from HTV5orbit.ini. There are no exhaust flames from main thrusters...
[EX_MAIN_0]
OFF=(-1.184,-0,-5.414)
DIR=(0,0,-1)
LENGTH=2
WIDTH=0.2
[EX_MAIN_1]
OFF=(1.184,-0,-5.414)
DIR=(0,0,-1)
LENGTH=2
WIDTH=0.2
[EX_MAIN_2]
OFF=(-0.002,1.182,-5.414)
DIR=(0,0,-1)...