I've had great success with only using the TWS downloaded to HD version (IOW not the "browser-loaded").
I am always behind several versions and I only upgrade to the latest when I am dragged kicking and screaming when the "You must upgrade to version XX or your TWS will no longer work..." type situation happens.
But then I just mostly use an API autotrading app and the same things, the same way, day in and day out. Rarely need the new features and I miss lots of hassles with the upgrades.
Good trading to all.