I have a sketch in an assembly which is used to drive the geometry.  Within this sketch I have a couple of blocks that are linked to files.  These blocks are also used in various parts in the assembly so their use seemed to be a good idea.  Update the block and Voila! all is well…  Yea, not so much.  Every time I make even a simple change the block every relation and dimension attached to them goes away and needs to be reattached.  Even if I just change one dimension in the block (and thus not changing the element names) everything is lost.  Is that normal or am I doing it wrong?