BUG! dyamic blocks lose dynamic behaviour (again...)

Hi all

I know we've had this discussion before, in fact it is everywhere on the good old interweb, but I can't seem to find an actual answer.

Why do some dynamic blocks, when copied and pasted into a drawing lose their dynamic behaviour?

Lots of users have reported this for years. Sometimes the behaviour disappears when using the align action as well.

Weird thing, you can paste a dynamic block into a drawing and it loses it. Paste the same dynamic block into a new drawing and it works fine.

Currently I have three instances of a dynamic pipe block that I've pasted into an existing drawing, the three instances all have different stretch lengths. When I paste them in they all lose their parameters & actions and revert to the block's orgininal length.

If I then edit one of the instances of the block and add the dynamic bits again then all three instances are now dynamic again! though I do have to resize them.

Has anyone ever worked this out?

Autodesk!? Are you out there? Is anyone listening?

the only time I have found this condition is when X, Y and Z scales are not identical. There is a bug in the scale command in that the Z scale is very slightly different to the X & Y scales. Resetting it to equal the other 2 has always resulted in my blocks regaining their dynamic properties.

This really shows up when AutoCAD decides it knows best about inserting blocks into drawings with different insert units set.