I have  BoM that is about 300 lines long.  I only want to show items that are relative to the current view/drawing so I am trying to select multiple items at once.  When I do this it only leaves the 2 lines highlighted (the original selection and the shift selection) and the items in between do not select.  When I control select line by line it takes about 5 seconds to select each line, so it is a pretty slow process.

Any ideas what can be causing the issue?