TortoiseMerge executed from commandline won't auto save to /Merged filename

We use TortoiseMerge (version 1.8) from the commandline providing it with the nesc. parameters:    /base:"$basefile" /theirs:"$branchtip" /mine:"$usertip" /merged:"$resultfile"    All actual files uses as temp files, stored in the applicationdata\temp directory on a windows workstation.    After show TortoiseMerge window I click "close the window" and the window is closing without SaveDialog for /merged:"$resultfile" and without save resultfile, regardless of there is a resultfile or not or resultfile is exists and it is empty or not.  This small problem makes a lot of problems for us.