RE: webcam is coming up with a white screen...
The new version is not 8.0. Please check what version you have by going to Help > About messenger and post the 'Build'.
If you are using the real new version of messenger(WLM 14..) and these contacts are using WLM 8.5, it is likely a bug which I have encountered a few times myself, and seems to be some sort of incompatibility between the new and old version, however there isn't much you can do about other than reporting it to the Windows Live team.
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