Index: code/mission/missioncampaign.cpp
===================================================================
--- code/mission/missioncampaign.cpp	(revision 9677)
+++ code/mission/missioncampaign.cpp	(working copy)
@@ -1249,6 +1249,7 @@
 
 /**
  * Called when the game closes -- to get rid of memory errors for Bounds checker
+ * also called at campaign init and campaign load
  */
 void mission_campaign_clear()
 {
@@ -1308,6 +1309,7 @@
 			sexp_unmark_persistent(Campaign.missions[i].formula);		// free any sexpression nodes used by campaign.
 		}
 
+		Campaign.missions[i].completed = 0;
 		Campaign.missions[i].num_goals = 0;
 		Campaign.missions[i].num_events = 0;
 		Campaign.missions[i].num_variables = 0;	// Goober5000