Thank you for your feedback, Hans.
I also noticed some weird issues with some texture images when they use transparency, and this problem was already there in version 3.1 when I added support for transparent PNGs.
I think it's due to OpenGL or maybe the library that calls OpenGL, so it will be almost impossible to fix, and you should use transparent PNGs only when necessary.
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Emmanuel Puybaret, Sweet Home 3D creator
