planet information Vizzy expression returning zero

I'm sure you already know this but it looks like new Planet elements are being spawned with the wrong op attribute: op="Radius" even though the drop down shows Mass selected in the UI.

Also, good news, it looks like all I have to do is change the dropdown and then change it back, to get it working, no extra steps needed.

Yup, that fixes the expression. I can repeatably repro: new expression with Mass selected returns zero, change drop down to Radius, save to craft, launch, exit, change drop down to Mass, save to craft, launch, correct value is returned. Thanks for the workaround!

Try switching the planet expression to something other than mass and then switch it back to mass and see if that fixes your particular issue.

Doesn't look like that was a factor, here is a brand new craft that has the problem: https://www.simplerockets.com/c/09JQ5v/Mass-Expression-Bug.

I was haxin with my FlightPrograms/__new__.xml file and one point trying to get a library of useful expressions to show up in all my new flight programs, but that didn't work because SimpleRockets seems to always overwrite it with the original. Here is what that file looks like now (except that all of the XML entity escaping is introduced by this websites broken markdown renderer):

<?xml version="1.0" encoding="utf-8"?>
<Program name="New Program">
   <Variables />
   <Instructions>
      <Event event="FlightStart" id="0" style="flight-start" pos="-10,-20" />
   </Instructions>
   <Expressions />
</Program>

Hmm, I have been known to do that. Let me try again from scratch.

Did you hand edit any XML in your Flight Program?