You don't say which version of CHIRP you are using. I just loaded the VX-3 image from the CHIRP repository into my CHIRP daily-20140105 and was able to edit and move any memory. I also imported a .csv file with more than 50 channels without any issues.

Try the latest daily build if you haven't already. And if that isn't it, attach you .img file for us to look at.

Jim KC9HI