The first visibility fix painted L4GLASSWIN -- a window the operator's single-window layout never shows. The main-window cockpit compositor is BTDrawCockpitPanels (L4VB16): same under-the-surface masking, so the RIO flash was again invisible. The 3b overlay now re-draws flashing lamps (state & 3) above the surfaces there, tick-phased; [ckflash] (BT_LAMP_LOG) logs each animated draw. Verified in-engine: addr 0x27 state 0x37 alternating shade 1 -> 3. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>