Google chrome. I don't think it is the browser that has trouble. as i've completed a game in adventuron before
Opera has a key binding issue (with control + space), which can be configured away (not described here), but I use Opera myself, and I can vouch that it works. Opera uses Chromium internally (same as Chrome), so there should not be compatibility issues.
Pixelman, please press F5 and try again if you can. I just uploaded beta 23, so maybe that will flush your clear your cache and sort it out?
Again, I'm aware I need an offline version of Adventuron, and this just reminds me of that.