I'll guess that its a false positive by AVG and both companies will need to work it out....but you'll want to keep an eye on the DoubleTwist forums. See the links below. So far, no responses for the "powers that be".
Occasionally, certain files on the program can actually be malware.. See the link below:
Hope this helps.
I have just upgraded Doubletwist but my AVG identified malware and removed Doubletwist from laptop