First of all, perform QA > Tags check. Also, make sure that the previously exported version of the document is not already opened in PowerPoint. If it does not help, submit a support ticket. There confirm whether you edited, moved or change otherwise the source language document before finishing its translation.
Elisabetta
Hello!
I've translated a pptx, exported it correctly, but cannot open it, I get the attached message, what can I do?
Thanks!!
Elisabetta