Can't open subVI by double clicking

Question

This is just irritating the heck out of me. I have a subVI that doesn't seem to be working as I think it should. I'm not sure if it is my problem or the subVI's.  But that's not what's bothering me.
If I double-click on the subVI icon (on the back panel of the parent subVI) nothing happens. The subVI does not open. If I right click on the icon and select Open, then the subVI will open. I can open all of the other subVIs on the back panel by double clicking on their icons.What parallel universe have I accidentally entered and how do I get back. I have two hungry daschunds waiting for me.
Solved!
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Answer 1

I said I couldn't open the subVI. I didn't know if the subVI or its
parent was the problem. I'm embarrassed to admit it, but it turns out mercurio had the winning solution.
Also, LabVIEW knows about the
error-list-causing-crashes problem and has a (mickey mouse but it
works) fix for it that involves putting a big cluster on my front
panel.
I
inherited this program. Most of the time I am busy trying to figure out
if the user has found a bug or a really creative way of screwing things
up, adding new features to the code, and getting out the latest
executable along with the latest and greatest user manual. This is a
small company. The previous programmer, who is now my supervisor, is a
very talented electrical engineer whos code works fine but looks like a
circuit board. There are several huge, complicated subVIs that I would
love to refactor. According to the VI analyzer, this program has 600+
local variables and 300+ global variables. I would love to clean all of
that crud up, but I don't get paid to fix things that already work. I
am not allowed to use object oriented concepts or any kind of
semaphores because they confuse my supervisor. I am working on getting
them to let me use some kind of source control program. This program
has close to 500 subVIs in it and keeping track of changes is becoming
too time consuming.