Hi peter,<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />
Thanks for your interest in Aspose.Slides.
In order to generate a new PPTX, the default PresentationEx() constructor is used but it seem to have problem while using. An issue with ID 14442 has already been created on our Issue Tracking System to fix the problem. This thread has also been associated with issue ID 14442, so that you can be automatically notified as soon as new version is available online. Hopefully, this issue will be fixed in the intermediate release that we are planning to launch by next week.
We are sorry for your inconvenience.