Image assets placed in the left/master frame of the master-detail iPad frame always revert to no-image when tested in the browser and when exported as xcode. You can place the same asset into a regular screen and the image asset works fine. This is reproducible every time.
I think you can only place a list (menu) into the left-hand side.. but we'll test.
I manually went into the generated code (Export for xcode) and changed the image src and it worked in the build. Just FYI.
Yes, that will work. Once you have the source you can do anything.
In Tiggzi builder that's a bug, we'll fix it.