Thanks for the quick answer. Your fix was already included in the version tested by me. Before your fix, the error message said something different. The only additional details I can tell you right now is that even "operator +=" is not found with a similar error message referring to EigenCwiseBinaryOp.
I will try on Monday to get it compiled with MSVC 2010 (good to know that it is "just" a technical issue and probably not laborious to fix).