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VIs Breaking When BD is Removed

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).

"If you weren't supposed to push it, it wouldn't be a button."
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