Recording with HyperCam.

You can usually record runescape, and other private servers using hypercam, Although this server does'nt let you, It just pauses the game and ends up being a long print screen ...

Is there a way to prevent this?

Hmmm..

I'm guessing your clicking pick window and then clicking on the game window? Try manually dragging it over the game window. If not, then try recording through the webclient.