i am building a world map out of premium tiles i got "old world style maps". after setting the base tiles, when i tryed to group them together the browser got stuck and crashes. i tried using chrome and Firefox browser and the same problem repeated again and again. i also tried to restart my computer and again the same problem. after following advice on forum= disabled ad block and flash block apps on chrome (deleted cach as well) i succedded to group tiles but. it is still very slow to react (when i try to select one tile it "thinks for a minute or so) or crashes again. i am adding the instructions in step 4 as document on a link please help me with it because it makes building a world map so slow and impossible feat to do.