It seems that Visio has some kind of incompability with Bluetooth drivers. I notice this problem when editing Visio objects embedded into Microsoft Word documents. In my case after I enabled Bluetooth (via my Compaq nw8440 special keyboard button) this problem went away.
It seems it’s impossible to do it from the user interface. But I found here that it could be done using a VB Macro: Sub ChangeAllTablesToNormal() Dim myTable As Table For Each myTable In ActiveDocument.Tables myTable.Select Selection.Style = ActiveDocument.Styles("Normal") Next myTable ActiveDocument.Repaginate End Sub You may try to change ActiveDocument.Styles("Normal") to ActiveDocument.Styles("Tables Normal") as suggested by Abhishek if it doesn’t work for you.