Bug with textures: Solids become transparent in rendered view

I need to get some quick pictures in rendered view but it’s impossible with this annoying bug. Any solution?

All bitmap are jpg files

You might try this “…nudging the transparency slider off of zero and back again on these materials…” from Here

thanks for the solution. In this case it works perfectly because i have a few materials. What if i’d had 100+ materials? The only solution is change one by one?

And the last question. What cause this error?

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Dunno… :thinking: