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Solved! Go to Solution.
Solved by JPlancke. Go to Solution.
I had the same problem, or something similar when trying to save.
Tried different things and the solution for me is when saving, the name already displays the extension. That gave me the problem. (i think it had something to do with the * or so)
So when saving i just deleted the extension in the name bar and it worked..
Don't know if it helps for the render but it might be a similar solution.