Thanks TGHoly!
released another update!
v.1.2.3
Fixed: Program would become unresponsive and crash when quitting if new scene was created previously.
Fixed: Selecting vertices with the marquee would sometimes not work.
Fixed: Moving tiles that are a part of an object at the same time with tiles that are not a part of an object would move them in different directions.
Added: Crosshair arrows can now move Objects.
Added: Textures can now be double-sided by pressing number 9 on keyboard. This toggles double-sided mode on/off for the currently selected tileset. This is more of a temporary solution for those requesting the feature.
v.1.2.2
Fixed: Mouse wheel wasn't working for zooming.
Fixed: Resizing tileset would mess up UVs for objects.
Fixed: Object points would appear larger when using a lower resolution.
Added: Options to select/deselect all objects in the scene regardless of type. Accessed in the context-menu by right-clicking the 3d scene.