Actually I logged that bug. Sorry I didn’t connect the dots in my head. I thought you were seeing one object, not no objects at all, but this makes sense now.
I wasn’t sure if that bug was related to my custom build or with Panda itself, but if you are having the same problem then it might be a bug in the Panda code. I think it was one of the recent additions that caused the problem. My build is working after I went back and got older versions of some files, so I’ll take a look and see what the difference is with the latest code.
One other thing to try first is replacing MyFragColor with the default name gl_FragColor in the shader.