I haven't had problems with registering the app. That's been fine.
My problem is the same as others have reported re Parallels. I have Firefox 3 set as my default browser, but when I try to do a capture, instead of opening FF3 on the Mac, it fires up Parallels Vista and then launches FF3 in that machine. I have switched off application sharing in Parallels and have confirmed that I am running the most up-to-date version of Parallels.
Someone suggested that there was an obscure setting somewhere to stop this, but neglected to share with us where that setting is/was! So, I'd really appreciate it if someone could elaborate on this.
This behaviour makes Little Snapper highly unusable. I don't want Vista to launch for purposes of getting a screen grab ;-)