Engine becomes negative mass

[snakeru]

I am scaling an 1.875 engine DOWN to 1.25. After rescale KSP is going crazy: engine destroys the launch pad even before ignition.

I think that's because of a negative mass:

This might be because I use RealFuels as well.

[Lisias]

I need your KSP.log .

This is a known issue, and the reason the latest version had programmatically withdrawn support for some parts. If this is happening with you, I need to check the TweakScale version you are using and the other add'ons, so I can pinpoint who is doing what and handle the thing with more finesse that I did in the last time. :)

Are you completely sure that this only happens while downscaling things�?

[Lisias]

Ouch. In time, I'm the new Maintainer. I just noticed this is the old repository when I tried to assign the issue to me. :)

Could you please move this to https://github.com/net-lisias-ksp/TweakScale ?