Hints at a resource issue, not necessarily videopad but because video editing/exporting can demand high resources.
Before beginning a new project, Clear Unused Cache Files, under OPTIONS | DISK tab.
Confirm that the video driver and Direct-X are current.
AMD / ATI users: [http://support.amd.com/us/gpudownload/Pages/index.aspx](http://support.amd.com/us/gpudownload/Pages/index.aspx) Intel users: [https://downloadcenter.intel.com/default.aspx](https://downloadcenter.intel.com/default.aspx) nVidia users: [http://www.nvidia.com/Download/index.aspx?lang=en-us](http://www.nvidia.com/Download/index.aspx?lang=en-us) Update DirectX: [http://support.microsoft.com/kb/179113](http://support.microsoft.com/kb/179113)