VIs Breaking When BD is Removed

[paul_cardinale]

When you save a VI without its block diagram using this

it might be broken after you close, then reopen it.
I have discovered the following things that can cause that:

1. An uninitialized shift register containing a class (seems to depend on what's in the mutation history)
2. A polymorphic subVI that references a VI that needs compiling.

There are probably other things, but those are the only two I've found (so far).