I get this nonsensical error seemingly randomly in Report Builder 2.0. Does anyone know why it comes up or how I can get rid of it?

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> The TablixRowHierarchy in tablix 'Tablix1' contains an inconsistent TablixHeader.Size in one or more of the TablixMembers that contain headers for TablixRow 2. TablixRow 2 has an expected total header size of 314.959993338585mm and an actual total header size of 314.960003936291mm. The total header size for each TablixRow created by the TablixRowHierarchy must be equal. 
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