Sorry to hear you are having problems exporting from popVideo 3.
I'm a little unclear if the problem is with exporting in .popvideo format or .avi format.
In case the problem is a usage issue, please watch the video tutorial below. This explains all the export options. If you then still have problems, please let us know at which point in the tutorial you have problems and also clarify if the issue is with exporting to .popvideo or .avi. Thanks.https://youtu.be/lrImo98fgmw