TheMadScientist - 7:00 pm on Feb 25, 2010 (gmt 0)

Got it, so you're not saying it was the direct cause, but rather amplified an already existent issue... Of course fixing it now (if more data related to bounce rate is the reason for the drop) is a bit more difficult than removing the RDFa markup, because the data has already been collected, so something other than removing the RDFa markup would need to be done as a solution to the problem.