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I am not sure if I get this right:

I understand that when you upgrade from 1.5.x to 2.0 beta release your style customizations will be lost. You have to redo all your customizations.

But I don't get the second part: When I redo that for 2.0 beta 1 for example, will I lose my customizations again when updating to 2.0 beta 2 at the moment?