When I get emailed a Power Point (PPTX) file and try to open it with my iPhone it will crash back to the home screen (Also, if I try to forward the same email with the attached it will also crash). Now I have found that if I reboot the phone it will then open it, but once I close the file and try to open it again it will crash till I reboot the phone. Does anybody else have this problem? or any suggestions?