Okay listen this has worked EVERYTIME for me
Many of you have said that refreshing is how you fix this glitch but in reality its much different.
Launch Monster Galaxy as you normally do. When you get to a Moga that freezes you I want you to copy the website and paste it onto a NORMAL Firefox or normal Internet explorer tab.
This is the link your have:
http://www.gaiaonline.com/monstergalaxy/launch
Now your see that its still frozen. To fix this just click on the refresh button and go to a different tab has its loading the page. Once the Monster Galaxy page has loaded look back and it'a show that the Moga battle will no longer be frozen.
IF THIS DOES work for you pass it on if it doesn't I'm sorry but that's the best I can do.
Respond to keep this post up please.