Re-install will do you no good. The problem is not on VisioList end it sounds like its you or your PC.
maybe use recaptcha option or security question instead
well it seems to be limited to you at the moment, as it works for me on your list. This captcha has been in use for over 10 years on many thousands of lists, this is the first reported issue I can recall.
no, not by default but you could create a plugin to do that.
that simply means, if a user buys premium membership, on new day you can add X hits to them which basically makes your premium members always show near the top at the start of a new day.
I was able to join your list and complete captcha with no problem. Perhaps you have a session issue with your browser, try closing your browser and start again.