diff --git a/release/datafiles/prvicons.png b/release/datafiles/prvicons.png
index cf8833c3362..f8f744aadb3 100644
Binary files a/release/datafiles/prvicons.png and b/release/datafiles/prvicons.png differ
diff --git a/source/blender/blenlib/intern/BLI_ghash.c b/source/blender/blenlib/intern/BLI_ghash.c
index 2adc24b657c..5462a61d967 100644
--- a/source/blender/blenlib/intern/BLI_ghash.c
+++ b/source/blender/blenlib/intern/BLI_ghash.c
@@ -61,6 +61,16 @@ const unsigned int hashsizes[] = {
 	268435459
 };
 
+/* internal flag to ensure sets values aren't used */
+#ifndef NDEBUG
+#  define GHASH_FLAG_IS_SET (1 << 8)
+#  define IS_GHASH_ASSERT(gh) BLI_assert((gh->flag & GHASH_FLAG_IS_SET) == 0)
+// #  define IS_GSET_ASSERT(gs) BLI_assert((gs->flag & GHASH_FLAG_IS_SET) != 0)
+#else
+#  define IS_GHASH_ASSERT(gh)
+// #  define IS_GSET_ASSERT(eh)
+#endif
+
 /***/
 
 typedef struct Entry {
@@ -346,6 +356,7 @@ bool BLI_ghash_reinsert(GHash *gh, void *key, void *val, GHashKeyFreeFP keyfreef
 void *BLI_ghash_lookup(GHash *gh, const void *key)
 {
 	Entry *e = ghash_lookup_entry(gh, key);
+	IS_GHASH_ASSERT(gh);
 	return e ? e->val : NULL;
 }
 
@@ -362,6 +373,7 @@ void *BLI_ghash_lookup(GHash *gh, const void *key)
 void **BLI_ghash_lookup_p(GHash *gh, const void *key)
 {
 	Entry *e = ghash_lookup_entry(gh, key);
+	IS_GHASH_ASSERT(gh);
 	return e ? &e->val : NULL;
 }
 
@@ -399,6 +411,7 @@ void *BLI_ghash_pop(GHash *gh, void *key, GHashKeyFreeFP keyfreefp)
 {
 	const unsigned int hash = ghash_keyhash(gh, key);
 	Entry *e = ghash_remove_ex(gh, key, keyfreefp, NULL, hash);
+	IS_GHASH_ASSERT(gh);
 	if (e) {
 		void *val = e->val;
 		BLI_mempool_free(gh->entrypool, e);
@@ -462,7 +475,6 @@ void BLI_ghash_clear(GHash *gh, GHashKeyFreeFP keyfreefp, GHashValFreeFP valfree
 void BLI_ghash_free(GHash *gh, GHashKeyFreeFP keyfreefp, GHashValFreeFP valfreefp)
 {
 	BLI_assert((int)gh->nentries == BLI_mempool_count(gh->entrypool));
-
 	if (keyfreefp || valfreefp)
 		ghash_free_cb(gh, keyfreefp, valfreefp);
 
@@ -773,9 +785,13 @@ GHash *BLI_ghash_pair_new(const char *info)
 GSet *BLI_gset_new_ex(GSetHashFP hashfp, GSetCmpFP cmpfp, const char *info,
                       const unsigned int nentries_reserve)
 {
-	return (GSet *)ghash_new(hashfp, cmpfp, info,
-	                         nentries_reserve,
-	                         sizeof(Entry) - sizeof(void *));
+	GSet *gs = (GSet *)ghash_new(hashfp, cmpfp, info,
+	                             nentries_reserve,
+	                             sizeof(Entry) - sizeof(void *));
+#ifndef NDEBUG
+	((GHash *)gs)->flag |= GHASH_FLAG_IS_SET;
+#endif
+	return gs;
 }
 
 GSet *BLI_gset_new(GSetHashFP hashfp, GSetCmpFP cmpfp, const char *info)
diff --git a/source/blender/blenlib/intern/edgehash.c b/source/blender/blenlib/intern/edgehash.c
index 8870bce435b..03822e894cf 100644
--- a/source/blender/blenlib/intern/edgehash.c
+++ b/source/blender/blenlib/intern/edgehash.c
@@ -55,6 +55,16 @@ static const unsigned int _ehash_hashsizes[] = {
 	268435459
 };
 
+/* internal flag to ensure sets values aren't used */
+#ifndef NDEBUG
+#  define EDGEHASH_FLAG_IS_SET (1 << 8)
+#  define IS_EDGEHASH_ASSERT(eh) BLI_assert((eh->flag & EDGEHASH_FLAG_IS_SET) == 0)
+// #  define IS_EDGESET_ASSERT(es) BLI_assert((es->flag & EDGEHASH_FLAG_IS_SET) != 0)
+#else
+#  define IS_EDGEHASH_ASSERT(eh)
+// #  define IS_EDGESET_ASSERT(es)
+#endif
+
 /* ensure v0 is smaller */
 #define EDGE_ORD(v0, v1) \
 	if (v0 > v1) {       \
@@ -242,6 +252,7 @@ void BLI_edgehash_insert(EdgeHash *eh, unsigned int v0, unsigned int v1, void *v
 {
 	unsigned int hash;
 	EdgeEntry *e;
+	IS_EDGEHASH_ASSERT(eh);
 	EDGE_ORD(v0, v1); /* ensure v0 is smaller */
 	hash = edgehash_keyhash(eh, v0, v1);
 	e = edgehash_insert_ex(eh, v0, v1, hash);
@@ -256,6 +267,8 @@ bool BLI_edgehash_reinsert(EdgeHash *eh, unsigned int v0, unsigned int v1, void
 	unsigned int hash;
 	EdgeEntry *e;
 
+	IS_EDGEHASH_ASSERT(eh);
+
 	EDGE_ORD(v0, v1); /* ensure v0 is smaller */
 	hash = edgehash_keyhash(eh, v0, v1);
 
@@ -278,6 +291,7 @@ bool BLI_edgehash_reinsert(EdgeHash *eh, unsigned int v0, unsigned int v1, void
 void **BLI_edgehash_lookup_p(EdgeHash *eh, unsigned int v0, unsigned int v1)
 {
 	EdgeEntry *e = edgehash_lookup_entry(eh, v0, v1);
+	IS_EDGEHASH_ASSERT(eh);
 	return e ? &e->val : NULL;
 }
 
@@ -290,6 +304,7 @@ void **BLI_edgehash_lookup_p(EdgeHash *eh, unsigned int v0, unsigned int v1)
 void *BLI_edgehash_lookup(EdgeHash *eh, unsigned int v0, unsigned int v1)
 {
 	EdgeEntry *e = edgehash_lookup_entry(eh, v0, v1);
+	IS_EDGEHASH_ASSERT(eh);
 	return e ? e->val : NULL;
 }
 
@@ -467,9 +482,13 @@ bool BLI_edgehashIterator_isDone(EdgeHashIterator *ehi)
 EdgeSet *BLI_edgeset_new_ex(const char *info,
                                   const unsigned int nentries_reserve)
 {
-	return (EdgeSet *)edgehash_new(info,
-	                               nentries_reserve,
-	                               sizeof(EdgeEntry) - sizeof(void *));
+	EdgeSet *es = (EdgeSet *)edgehash_new(info,
+	                                      nentries_reserve,
+	                                      sizeof(EdgeEntry) - sizeof(void *));
+#ifndef NDEBUG
+	((EdgeHash *)es)->flag |= EDGEHASH_FLAG_IS_SET;
+#endif
+	return es;
 }
 
 EdgeSet *BLI_edgeset_new(const char *info)