The error I'm getting is that basically, when I set firefox's proxy settings to use the VM, Noscript gets confused and blocks all scripts even though I've previously had the sites whitelisted. I can't tell exactly what's happening, but the site doesn't show up in the menu of "allow" options properly either. Sometimes it appears in square brackets and greyed out / disabled. (Also, I have whitelisted the sites with RequestPolicy -- everything was working, and starts working again, when I don't use the proxy.) Example on google.com:

I should note also that I DON'T have any problems with noscript when running from within another VM on the same machine, or from firefox on a separate machine, even when using the same proxy VM. It appears to possibly be some weirdness relating to the network or addressing of the local VM, but I don't know how to investigate any further.
Any suggestions? I'm currently running the latest 2.3.5rc6 dev build, and before that had the latest stable version from addons.mozilla.org, I think that would be 2.3.5. Is there a way to find out what's going on in more detail?