The version 3.4 Beta 31 brings some corrections to some old bugs I finally found how to fix:
- a bug that reset 3D view aspect ratio after a camera change (see here),
- a bug that displayed a texture as inverted when applied to the left side of a wall,
- a bug that wrongly shifted the texture applied on an object with a 3D model file not placed at the origin (see here). The correction of this last bug helped me also to find how to show a texture correctly on the front side of an object, so you don't have to turn it around to see its back face. This new behavior will be applied only to the texture changes you'll make from this version.

how used the new Beta in my operation sistem Windows7?

Install Java on your computer and click on this link. If it doesn't install the current beta on your system, then please wait for the final release a few more days.