zel365 showed me this bug with deleting nla keys...

If I had to guess REMAKEIPO is kind of miss named.
since what it does it free up memory it almost looks like it should be a part of
REMAKEALLIPO we both felt a little overwhelmed by the code though and opted for
just calling both of them in delete_nlachannel_keys
I also added in         allqueue (REDRAWVIEW3D, 0);
since things could probably change around since your recalcing the ipo's...

Kent

source/blender/src/editnla.c

@@ -979,6 +979,8 @@ static void delete_nlachannel_keys(void)
 	}
 	
 	allspace(REMAKEALLIPO, 0);
+        allspace(REMAKEIPO,0);
+	allqueue (REDRAWVIEW3D, 0);
 	allqueue(REDRAWNLA, 0);
 	allqueue(REDRAWIPO, 0);
 }