diff --git a/ubb-la/gui.c b/ubb-la/gui.c
index 0743e97..1f90294 100644
--- a/ubb-la/gui.c
+++ b/ubb-la/gui.c
@@ -232,7 +232,7 @@ static void show_buffer_zoom_in(const uint8_t *buf, int skip, int nibbles,
 	int last[4] = { -1, -1, -1, -1};
 	uint8_t v, bit;
 
-	DEBUG("in: %d-%d (%d) Sa %d-%d (%d) pix %d f (%d)\n",
+	DEBUG("in: %d-%d (%d) Sa; %d-%d (%d) pix; %d f (%d)\n",
 	    skip, nibbles, nibbles-skip, x0, x1, x1-x0, f, f*(nibbles-skip));
 	x = x0;
 	for (i = skip; i != nibbles; i++) {
@@ -261,7 +261,7 @@ static void show_buffer_zoom_out(const uint8_t *buf, int skip, int nibbles,
 	int changes[4], last[4] = { -1, -1, -1, -1}, next[4];
 	uint8_t v, bit;
 
-	DEBUG("out: %d-%d (%d) Sa %d-%d (%d) pix %d f (%d)\n",
+	DEBUG("out: %d-%d (%d) Sa; %d-%d (%d) pix; %d f (%d)\n",
 	    skip, nibbles, nibbles-skip, x0, x1, x1-x0, f, f*(x1-x0));
 	for (x = x0; x != x1; x++) {
 		n = i+f;
@@ -301,6 +301,8 @@ static void show_buffer(const uint8_t *buf, int skip, int nibbles,
 
 	xm = (x0+x1) >> 1;
 	dp = pos-((nibbles+skip) >> 1);
+	DEBUG("show: %d-%d Sa; %d-%d pix; pos %d dp %d; xm %d xcenter %d\n",
+	    skip, nibbles, x0, x1, pos, dp, xm, XCENTER);
 	if (zoom < 0) {
 		s = (x1-x0) << -zoom;
 		show_map(skip, nibbles, pos-s/2, pos+s/2);