Resources which are added dynamically by a plugin disappear when you change scenes.

[ialdabaoth]

Yeah.

So, Let's say I have a plugin that scans the parts list, and lets you replace dynamically LiquidFuel, Oxidizer, Monopropellant, or any other pumpable fluid. Basically, it lets you reconfigure the fuel tank load of any fuel tank to carry an equivalent volume of any combination of fluids that you want.

The trouble is, when I reach the launchpad, any resources that I've deleted from the part stay deleted, but any resources that I've added from the part go away. The resources are absolutely in the part in the VAB, but as soon as the scene changes it all disappears.

Any idea what's going on here?

[ummwut]

When you switch scenes, the parts are destroyed and rebuilt, and new code is called. If you can, try and figure out what is being called and when.