Thanks for your report emmanuel1081,
do you encounter this problem only on proxynova.com? If so they changed a piece of the encoding logic, I've already a fix for this issue but the next release will be a bit delayed because I'm quite busy.
If you have this problems on all websites then you'd have to send me a list and I'll look in to it.
May I ask a newbie question: after I use a firefox plug-in to change my IP to proxy IP that I got from your program list, it says that I need to fill the username and password for this proxy IP in order to connect to internet. And I don't know what is the Username and PW, what did I miss or what should I change on my router's setting? Sorry that I'm confused.