What version of Videopad is in use? Here's the latest. For licensed users upgrades are free for up to six months. After that, VP will continue to fully function but a fee will be required in order to register the newest. Retain your old licensed installer and registration info should you want to revert.
If you continue to encounter direct-to-YouTube upload problems, simply save your project in one of their accepted video formats - 3GPP, AVI, FLV, MOV, MPEG4, MPEGPS, WebM and WMV. MPEG4 commonly uses the .mp4 file extension. Then use their uploader.