You could update the firmware, 1.1 is out.
A few things. Are you using a Nextion, have you built the extra stuff necessary (ie, another arduino nano?).
(I have a question about that, there's got to be a script/hex specifically for the 2nd nano, right?)
I have yet to put my uBitx all together, getting everything together first (Nextion 3.2")
But I think you need to use Memory Manager in order to get the s-meter working.
Or I could be completely off-base, as I'm very new to all this.
Dave - AI6K