Hmm. Just tried to do Tifa's sidequest, but when I get to her boss fight in the Reactor, the battle transition occurs and then the game freezes. Not sure what's going on. I'm using the IRO version, if it helps.
EDIT: Here is what the crash log says.
[00000000] INFO: FF7/FF8 OpenGL driver version 0.8.1b
[00000000] INFO: Auto-detected version: FF7 1.02 US English
[00000000] INFO: NVIDIA Corporation GeForce GT 640/PCIe/SSE2 4.5.0 NVIDIA 375.70
[00000000] INFO: OpenGL 2.0 support detected
[00000000] INFO: Found swap_control extension
[00000000] INFO: Max texture size: 16384x16384
[00000000] INFO: Original resolution 640x480, window size 1680x1050, output resolution 1680x1050, internal resolution 3840x2160
[00000000] INFO: Shader limits: varying 124, vert uniform 4096, frag uniform 4096
[00000000] INFO: FFMpeg movie player plugin loaded
[00000000] INFO: FFMpeg version SVN-r25886, Copyright (c) 2000-2010 Fabrice Bellard, et al.
[00000000] INFO: VGMStream music plugin loaded
[00000000] INFO: Loading external library Multi.dll
[00000000] LOCK UNLOCK TEST
[00000001] MATRIX INITIALIZE
[00000001] INITIALIZE DD/D3D END
[00000001] initializing sound...
[00000001] creating dsound primary buffer
[00000001] reading audio file
[00000001] loading static sounds
[00000001] sound initialized
[00000001] set music volume: 127
[00000001] set music volume: 127
[00000001] Entering MAIN
[00000001] Exiting MAIN
[00000001] START OF CREDITS!!!
[00000001] INFO: C:\FF7 Original\data\movies\eidoslogo.avi; h264/aac 1280x896, 15.000000 FPS, duration: 11.333333, frames: 170
[00000028] set music volume trans: 127->0, step=60
[00000093] END OF CREDITS!!!
[00000093] Entering MAIN
[00000093] set music volume: 127
[00000093] Exiting MAIN
[00000093] START OF MENU SYSTEM!!!
[00000251] END OF MENU SYSTEM!!!
[00000251] Entering MAIN
[00000255] Exiting MAIN
[00000255] Field Start
[00001905] Field Quit
[00001905] Entering MAIN
[00001905] Exiting MAIN
[00001905] Entering FRAME_INITIALIZE SWIRL
[00001905] Exitting FRAME_INITIALIZE SWIRL
[00001908] Swirl sound_effect1
[00001908] stop_sound
[00001908] End of Swirl sound_effect1
[00001987] Entering FRAME_QUIT SWIRL
[00001987] Exitting FRAME_QUIT SWIRL
[00001987] Entering MAIN
[00001989] Exiting MAIN
[00001989] [BATTLE] Entering FRAME_INITIALIZE
[00001989] [BATTLE] Scene# 312
[00001989] [BATTLE] Exitting FRAME_INITIALIZE
[00001990] : [00001990] : [00001990] : [00001990] WM_CLOSE
[00001990] : unhandled exception