Update your bookmark to include http://www.chess.com/switch. It will bring you to the old version.
"Try the new chess.com" on the bottom of the page will take you to the new version.
Flip flop from version 3 to version 2...
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Clearing your vache shouldn't switch you. Clearing your cookies on the otherhand ....
How do I go back to version2 from version3?
Look for this, it will take you back to V2. I have my icons at the top but yours might be down left hand side. Hope that helps. 
OK. So Chess.com on my computer switches to V3...I figure OK I'll bite the bullet and use it. I frequently clear my browser cache and after that it flips back to V2...What to do?