This works well: dosbox -c mem /tmp/mydir
... DOSBox opens new window, executes "mem" command, then mounts /tmp/mydir as C:.

This works with bug: dosbox -lang my.lng /tmp/mydir
... Language file is successfully loaded, but!!! directory name is ignored, i.e. nothing is mounted.

This works with bug: dosbox -lang my.lng -c mem /tmp/mydir
... Language file is successfully loaded, then "mem" command is executed, but directory name still ignored, i.e. nothing is mounted.

Conclusion: some command line switches (-conf and -lang) causes incorrect parsing of cmdline tail. Tested on 0.61 release and on CVS snapshot.