How long are you waiting after you click "Continue"?
Have you tried not loading it without your account details(IE: No Username and Pass)?
Log into Runescape first, then run OSBot Mirror Mode, and see if the RS Client because super laggy, if it does, that means it's trying to hook to it.
Try with both the official RS Client and OSBuddy.
Make sure that you're using the 32bit Java and not the 64bit.
Just a few options to try out. Note that the hooking process can take longer than a minute sometimes. So after you click "Continue" wait a bit.