Hi quark,
I think I’ve found the problem. Hopefully you can point me in the right direction. I hope you can remember that I’ve created a new class called: “GEncoderKnob”. If I comment out all related code the export works fine. Like I said in my earlier comments : “It’s probably my programming skills that somehow mess up the program when exported”. This might be the case here 
A small test program I’ve created, of which the code I’ve shared (in a different post) works under processing IDE but I can’t get it working in an export. Is there a way you can try if you can export the test code and see if you encounter the same issues I’m having?
Any help as usual greatly appreciated.