was design extender installed last?
The onMouseUp errors is an issue caused by a bug in Dreamweaver CS6, the short story: Adobe removed the onMouseUp function in DW CS6 and we use in quite a lot of places across all our extensions. in the latest eCart and design Extender updates, one of the changes we are making is to stop suing onMouseUp. the migration to completely fix that error wont be complete though till the DataBridge update is released late this week or early next.