Alright, tested that out and it all works perfectly here. Again make sure that you're opening the file that RTT saves, in the File Name and Type box, instead of saving out the image in the render preview.
Other than that i cant be of any help, because i'm not getting the error here, sorry dude.
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Also, make sure you're opening the file max saves, not saving what it gives you in the render preview window, as max doesnt add padding to that.
Other than that i cant be of any help, because i'm not getting the error here, sorry dude.