In the diagram in Edit mode, the wrong pieces are showing for both sides (e.g. Cannons instead of Caliphs for C; edit2: however, in Playtester's Frog Chess enforced, falcons show instead of frogs when in edit mode);
This is a general problem with defining the piece images through GAME code, as you are doing here in the last part of the Pre-Game section: Game Courier then only knows which images you requested when it executes the GAME code. Which it only does when you are playing. Not while you are editing.
The alternative is not to copy these image definitions that the Applet suggests to the Pre-Game section, but rely on the piece set you selected in Game Courier when making the preset, and make sure you use the same piece IDs in the Interactive Diagram you convert as used in the selected piece set.
This is a general problem with defining the piece images through GAME code, as you are doing here in the last part of the Pre-Game section: Game Courier then only knows which images you requested when it executes the GAME code. Which it only does when you are playing. Not while you are editing.
The alternative is not to copy these image definitions that the Applet suggests to the Pre-Game section, but rely on the piece set you selected in Game Courier when making the preset, and make sure you use the same piece IDs in the Interactive Diagram you convert as used in the selected piece set.