From 8649d25cffb40632af1f0311b5902316940c68fc Mon Sep 17 00:00:00 2001
From: Paul <paul@localhost>
Date: Thu, 21 Dec 2000 15:51:24 +0000
Subject: [PATCH]

---
 source/system/vid.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/source/system/vid.cpp b/source/system/vid.cpp
index 82a814c35..1be72392c 100644
--- a/source/system/vid.cpp
+++ b/source/system/vid.cpp
@@ -402,6 +402,12 @@ if(ScreenClipBox==2)
 	int	fc=FrameCounter;
 	s_vblsThisFrame=fc-s_lastFrameCounter;
 	s_lastFrameCounter=fc;
+
+	// Can get 0 vbls during start up, and it breaks things
+	if(s_vblsThisFrame==0)
+	{
+		s_vblsThisFrame=1;
+	}
 }