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I would say that looks like Air in the expansion tank, if you have a leak and air is getting in you'd see some foam. When you topped it off what did you use? some colors aren't mixable with the BMW Blue.
If you have a leak air is getting in the system, which would cause you to overheat.
You'll need to fix the leak and then bleed the system using the electric waterpump. IF the electric waterpump isn't working you wouldn't be getting the stream on your picture, also you'd havea CEL.
I'd get it flushed once you've fixed it or do it yourself. Good Luck
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