Using Windows Tiles on a compiled from very recent sources build.
After a successfull attempt at remappind the VI keys to something sensible for Dvorak (see dvorak_command_keys.txt), movement by mouse fails in interesting ways.
After a bit of forethougth, it seems to be trying to use the original VI-keys for movement induced by mouse click rather than the remapped ones.
An example : Trying to move directly one tile down causes the game to think you wanted to drop ( (j)unk ) something instead of moving down. In original VI-keys, going down was mapped to j.
Spell zapping is not affected and works fine.