Same problem here! I am using Avast!
Can't understand why should I disable my antivirus software in order to use Stocksubmitter?
First of all, you don't need to disable it permanently, just temporary as a diagnostic measure.
If the problem is in the antivirus then you will need to somehow add the program to the exceptions.
Why doesn't it work without disabling antivirus or adding the program to the exceptions?
Because Avast for some reason has lots of false positive reactions. This question is better to address to devs of Avast.
Personally I'm using only Common Sense antivirus and never had any problems with that.