hi @Lisias, i was a while off playing KSP.  started last we and found a little bug in your latest release 4.0 have "Universal Storage II"and "KSP Recall" installed build a new craft using Universal Storage: Four Bay Service Core OR Advanced Sub Satellite. open the Console and you will see spamming messages like [LOG 23:29:50.011] [Universal_Storage] USSolarSwitch.GetModuleMass, SolarCellMass: 0 [LOG 23:29:50.011] [Universal_Storage] USSolarSwitch.GetModuleMass, SolarCellMass: 0
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