diff --git a/source/blender/blenkernel/intern/sequencer.c b/source/blender/blenkernel/intern/sequencer.c
index 56e34bbeb11..2b68e811d17 100644
--- a/source/blender/blenkernel/intern/sequencer.c
+++ b/source/blender/blenkernel/intern/sequencer.c
@@ -2945,20 +2945,25 @@ static ImBuf *seq_render_movie_strip(const SeqRenderData *context, Sequence *seq
 
 		if (totfiles != BLI_listbase_count_at_most(&seq->anims, totfiles + 1))
 			goto monoview_movie;
 
 		totviews = BKE_scene_multiview_num_views_get(&context->scene->r);
 		ibuf_arr = MEM_callocN(sizeof(ImBuf *) * totviews, "Sequence Image Views Imbufs");
 
 		for (i = 0, sanim = seq->anims.first; sanim; sanim = sanim->next, i++) {
 			if (sanim->anim) {
 				IMB_Proxy_Size proxy_size = seq_rendersize_to_proxysize(context->preview_render_size);
+
+				if ((seq->flag & SEQ_USE_PROXY) == 0) {
+					proxy_size = IMB_PROXY_NONE;
+				}
+
 				IMB_anim_set_preseek(sanim->anim, seq->anim_preseek);
 
 				ibuf_arr[i] = IMB_anim_absolute(sanim->anim, nr + seq->anim_startofs,
 				                                seq->strip->proxy ? seq->strip->proxy->tc : IMB_TC_RECORD_RUN,
 				                                proxy_size);
 
 				/* fetching for requested proxy size failed, try fetching the original instead */
 				if (!ibuf_arr[i] && proxy_size != IMB_PROXY_NONE) {
 					ibuf_arr[i] = IMB_anim_absolute(sanim->anim, nr + seq->anim_startofs,
 					                                seq->strip->proxy ? seq->strip->proxy->tc : IMB_TC_RECORD_RUN,
@@ -3011,20 +3016,25 @@ static ImBuf *seq_render_movie_strip(const SeqRenderData *context, Sequence *seq
 			}
 		}
 
 		MEM_freeN(ibuf_arr);
 	}
 	else {
 monoview_movie:
 		sanim = seq->anims.first;
 		if (sanim && sanim->anim) {
 			IMB_Proxy_Size proxy_size = seq_rendersize_to_proxysize(context->preview_render_size);
+
+			if ((seq->flag & SEQ_USE_PROXY) == 0) {
+				proxy_size = IMB_PROXY_NONE;
+			}
+
 			IMB_anim_set_preseek(sanim->anim, seq->anim_preseek);
 
 			ibuf = IMB_anim_absolute(sanim->anim, nr + seq->anim_startofs,
 			                         seq->strip->proxy ? seq->strip->proxy->tc : IMB_TC_RECORD_RUN,
 			                         proxy_size);
 
 			/* fetching for requested proxy size failed, try fetching the original instead */
 			if (!ibuf && proxy_size != IMB_PROXY_NONE) {
 				ibuf = IMB_anim_absolute(sanim->anim, nr + seq->anim_startofs,
 				                         seq->strip->proxy ? seq->strip->proxy->tc : IMB_TC_RECORD_RUN,
diff --git a/source/blender/makesrna/intern/rna_sequencer.c b/source/blender/makesrna/intern/rna_sequencer.c
index c01f59582d1..d0ddeb0c514 100644
--- a/source/blender/makesrna/intern/rna_sequencer.c
+++ b/source/blender/makesrna/intern/rna_sequencer.c
@@ -318,21 +318,23 @@ static void rna_Sequence_frame_offset_range(PointerRNA *ptr, int *min, int *max,
                                            int *UNUSED(softmin), int *UNUSED(softmax))
 {
 	Sequence *seq = (Sequence *)ptr->data;
 	*min = ELEM(seq->type, SEQ_TYPE_SOUND_RAM, SEQ_TYPE_SOUND_HD) ? 0 : INT_MIN;
 	*max = INT_MAX;
 }
 
 static void rna_Sequence_use_proxy_set(PointerRNA *ptr, bool value)
 {
 	Sequence *seq = (Sequence *)ptr->data;
+	Scene *scene = (Scene *)ptr->id.data;
 	BKE_sequencer_proxy_set(seq, value != 0);
+	BKE_sequence_invalidate_cache(scene, seq);
 }
 
 static void rna_Sequence_use_translation_set(PointerRNA *ptr, bool value)
 {
 	Sequence *seq = (Sequence *)ptr->data;
 	if (value) {
 		seq->flag |= SEQ_USE_TRANSFORM;
 		if (seq->strip->transform == NULL) {
 			seq->strip->transform = MEM_callocN(sizeof(struct StripTransform), "StripTransform");
 		}