[Therion] Difference between Debian and win7

Hi all, I use therion 5.3.10, and a workaround with vertical survey (replace +/-90 with +/-89.99) and vthreshold 90 deg with to stay on LRUD system. But now, with 5.3.10 version, this solution works fine on windows version, but it doesn't work on debian (wheezy/sid and squezze). On attachment a cave test with loch and xvi files, and the result with debian and windows. Do you have the same result on linux ? and do you have an idea to solve this issue ? My main machine is on debian... and I have a few caves to convert to therion :'( Regards, Laurent.