I'm sorry but in the rush to get Dungeon Maker Sketch 0.40 released today i left some bugs in there. This update is to fix them.

Changed version number in top left to correct version
Fixed maps not clearing when opening a new one
Changed selection tool button to "Tab" (You can remove objects now on either modes selection or build)
Changed collision box of some objects
Fixed selection rectangle not being correct colour
Added shift clicking to select multiple objects in selection mode
Fixed menu position when resizing the window