Fix black screen issue after training level

source/exhumed/src/exhumed.cpp

@@ -2669,7 +2669,7 @@ int app_main(int argc, char const* const* argv)
     }
 MENU:
     SavePosition = -1;
-    nMenu = menu_Menu(1); // TODO: Revert to 0 after fixing demo playback
+    nMenu = menu_Menu(0);
     switch (nMenu)
     {
     case -1:

source/exhumed/src/light.cpp

@@ -232,6 +232,7 @@ void BlackOut()
         curpalettefaded[i].b = 0;
     }
     videoUpdatePalette(0, 256);
+    g_lastpalettesum = -1;
 #ifdef USE_OPENGL
     videoTintBlood(0, 0, 0);
 #endif
@@ -290,6 +291,7 @@ void DoFadeToRed()
     }
 
     videoUpdatePalette(0, 256);
+    g_lastpalettesum = -1;
 }
 
 void FadeToWhite()
@@ -336,6 +338,7 @@ void FadeToWhite()
         }
 
         videoUpdatePalette(0, 256);
+        g_lastpalettesum = -1;
         WaitTicks(2);
 
         // need to page flip in each iteration of the loop for non DOS version
@@ -394,6 +397,7 @@ void FadeOut(int bFadeMusic)
         }
 
         videoUpdatePalette(0, 256);
+        g_lastpalettesum = -1;
         WaitTicks(2);
 
         // need to page flip in each iteration of the loop for non DOS version
@@ -466,6 +470,7 @@ int DoFadeIn()
     }
 
     videoUpdatePalette(0, 256);
+    g_lastpalettesum = -1;
 
     return v2;
 }
@@ -580,7 +585,10 @@ void FixPalette()
     if (videoGetRenderMode() >= REND_POLYMOST) videoTintBlood(rtint, gtint, btint);
     else
 #endif
-    videoUpdatePalette(0, 256);
+    {
+        videoUpdatePalette(0, 256);
+        g_lastpalettesum = -1;
+    }
 }
 
 void TintPalette(int r, int g, int b)

source/exhumed/src/menu.cpp

@@ -1543,10 +1543,11 @@ int menu_Menu(int nVal)
             }
         }
 
+        // TODO: Uncomment after fixing demo playback
         // menu idle timer
-        if (!nVal && (int)totalclock > keytimer) {
-            return 9;
-        }
+        // if (!nVal && (int)totalclock > keytimer) {
+        //     return 9;
+        // }
 
         // loc_39F54:
         menu_DoPlasma();