I have used this program at least ten times with the same camera, no setting changes or anything. Last time i tried to combine my videos i got the error message "cannot combine vidoes", now i know there is file limitations and format restrictions. all the clips are MP4, combined total is only 355MB. and all the clips were taken in sequence. i went through this process multiple times with other video clip with flawless success. i have done a direct import of movies, deleted them and tried again, i have restarted my computer and the program, i even uninstalled the program and re-installed it. I though there might be an issue of the amout of individual clips(43) but i have done this process with the same amout of clips, even a few more with no issue...any thoughts?