- code that limited zooming in and zooming out for spaces like sequencer,

audiotimeline, etc. was accidentally removed in 2.30 UI makeover. put
  it back. fixes report in tracker from Cessen, thnx!

source/blender/src/buttons_editing.c

@@ -964,7 +964,7 @@ static void editing_panel_curve_type(Object *ob, Curve *cu)
 	if(ob->type!=OB_SURF) {
 		
 		if(ob->type==OB_CURVE) {
-			static float prlen;
+			extern float prlen;		// buttons_object.c, should be moved....
 			char str[32];
 			uiBlockBeginAlign(block);
 			uiDefButS(block, NUM, B_RECALCPATH, "PathLen:",			600,50,150,19, &cu->pathlen, 1.0, 9000.0, 0, 0, "");