internet explorer 7 ie7 in crossover office shows runonce.msn.com/runonce3.aspx every time

After upgrading from ie6 to ie7 for our crossover pro users, we found that they were all getting the runonce page (http://runonce.msn.com/runonce3.aspx) and couldn't get rid of it. Searching the codeweaver support site didn't help, the only advice given there was to ignore the issue.
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