4 files changed, 25 insertions, 4 deletions
diff --git a/source/blender/blenkernel/BKE_blender.h b/source/blender/blenkernel/BKE_blender.h
index d35ff80265f..ec595320d6a 100644
--- a/source/blender/blenkernel/BKE_blender.h
+++ b/source/blender/blenkernel/BKE_blender.h
@@ -51,7 +51,7 @@ extern "C" {
 /* can be left blank, otherwise a,b,c... etc with no quotes */
 #define BLENDER_VERSION_CHAR   
 /* alpha/beta/rc/release, docs use this */
-#define BLENDER_VERSION_CYCLE   rc
+#define BLENDER_VERSION_CYCLE   release
 
 extern char versionstr[]; /* from blender.c */
 
diff --git a/source/blender/blenkernel/intern/image.c b/source/blender/blenkernel/intern/image.c
index 55699bc0aae..b8b126c4c8e 100644
--- a/source/blender/blenkernel/intern/image.c
+++ b/source/blender/blenkernel/intern/image.c
@@ -3620,6 +3620,7 @@ ImBuf *BKE_image_get_ibuf_with_name(Image *image, const char *name)
 				IMB_refImBuf(ibuf);
 				break;
 			}
+			IMB_moviecacheIter_step(iter);
 		}
 		IMB_moviecacheIter_free(iter);
 	}
diff --git a/source/blender/blenkernel/intern/object.c b/source/blender/blenkernel/intern/object.c
index 43dbc34f3d3..0970af46a6b 100644
--- a/source/blender/blenkernel/intern/object.c
+++ b/source/blender/blenkernel/intern/object.c
@@ -331,6 +331,10 @@ void BKE_object_free_derived_caches(Object *ob)
 			free_path(ob->curve_cache->path);
 			ob->curve_cache->path = NULL;
 		}
+
+		/* Signal for viewport to run DAG workarounds. */
+		MEM_freeN(ob->curve_cache);
+		ob->curve_cache = NULL;
 	}
 }
 
@@ -1282,6 +1286,7 @@ static ParticleSystem *copy_particlesystem(ParticleSystem *psys)
 	psysn->pdd = NULL;
 	psysn->effectors = NULL;
 	psysn->tree = NULL;
+	psysn->bvhtree = NULL;
 	
 	BLI_listbase_clear(&psysn->pathcachebufs);
 	BLI_listbase_clear(&psysn->childcachebufs);
diff --git a/source/blender/blenkernel/intern/particle_system.c b/source/blender/blenkernel/intern/particle_system.c
index 3f4c53692e5..e7c2bf605c3 100644
--- a/source/blender/blenkernel/intern/particle_system.c
+++ b/source/blender/blenkernel/intern/particle_system.c
@@ -109,6 +109,8 @@
 
 #endif // WITH_MOD_FLUID
 
+static ThreadRWMutex psys_bvhtree_rwlock = BLI_RWLOCK_INITIALIZER;
+
 /************************************************/
 /*			Reacting to system events			*/
 /************************************************/
@@ -2209,15 +2211,22 @@ static void psys_update_particle_bvhtree(ParticleSystem *psys, float cfra)
 	if (psys) {
 		PARTICLE_P;
 		int totpart = 0;
+		bool need_rebuild;
 
-		if (!psys->bvhtree || psys->bvhtree_frame != cfra) {
+		BLI_rw_mutex_lock(&psys_bvhtree_rwlock, THREAD_LOCK_READ);
+		need_rebuild = !psys->bvhtree || psys->bvhtree_frame != cfra;
+		BLI_rw_mutex_unlock(&psys_bvhtree_rwlock);
+		
+		if (need_rebuild) {
 			LOOP_SHOWN_PARTICLES {
 				totpart++;
 			}
 			
+			BLI_rw_mutex_lock(&psys_bvhtree_rwlock, THREAD_LOCK_WRITE);
+			
 			BLI_bvhtree_free(psys->bvhtree);
 			psys->bvhtree = BLI_bvhtree_new(totpart, 0.0, 4, 6);
-
+			
 			LOOP_SHOWN_PARTICLES {
 				if (pa->alive == PARS_ALIVE) {
 					if (pa->state.time == cfra)
@@ -2227,8 +2236,10 @@ static void psys_update_particle_bvhtree(ParticleSystem *psys, float cfra)
 				}
 			}
 			BLI_bvhtree_balance(psys->bvhtree);
-
+			
 			psys->bvhtree_frame = cfra;
+			
+			BLI_rw_mutex_unlock(&psys_bvhtree_rwlock);
 		}
 	}
 }
@@ -2546,7 +2557,11 @@ static void sph_evaluate_func(BVHTree *tree, ParticleSystem **psys, float co[3],
 			break;
 		}
 		else {
+			BLI_rw_mutex_lock(&psys_bvhtree_rwlock, THREAD_LOCK_READ);
+			
 			BLI_bvhtree_range_query(psys[i]->bvhtree, co, interaction_radius, callback, pfr);
+			
+			BLI_rw_mutex_unlock(&psys_bvhtree_rwlock);
 		}
 	}
 }