state not saved correctly

[zepumph]

Copied from https://github.com/phetsims/phet-io/issues/851 to this repo

@samreid said
From #319:

1. Some photons are "leaking" and not getting removed from state
2. Clicking "Launch" yields a "duplicate item" issue
3. Molecule state is not saved.

And we reproduced this problem and January 11th, 2017

[pixelzoom]

@zepumph I don't see any commits that indicate this was fixed in phetsims/phet-io#851. Is this still a problem? Did you close this issue by mistake?

[pixelzoom]

Ah... Looks like you created this issue in the wrong repo, should have been in molecules-and-light. Closing.

[zepumph]

Sorry about that. no communication on that one, see phetsims/molecules-and-light#154 for the proper living space for this issue.