Been enjoying the game alot more today after a bit of practice... Easy is far too easy, but Medium is quite a good challenge. One or two things seem a bit odd though - I saved up Wumpa coins to buy an item from the 'Pit Stop' section (a paint skin) but it isn't letting me buy it. I have over 4000 Wumpa coins and the skin is only 1500. When I went to unlock it, it says 'Are you sure you want to unlock this item?' and I click on OK, but then nothing happens. Any ideas why that is?