A flag patched in the data is set back in code by a newer build

Symptoms

The same patch as on the older build, at the mapped address, has no effect: POD Gold still asks DirectDraw for exclusive fullscreen (SetCooperativeLevel flags 0x51) and fails with lpDD::SetDisplayMode->DDERR_UNSUPPORTED.

Cause

The first edition kept its fullscreen flag only as initialised data (0x4f7260). Gold has the flag at 0x4eac84 and also stores 1 into it at start-up (0x4a147d in FUN_004a1460) (observed).

Evidence

A +ddraw trace showed the flags; listing every write to the mapped global found the store.

What to do

After carrying a data patch to a new build, list every write to that global (the export's decompile, or a byte search for the address in mov instructions) and patch the ones that undo it.