Quite often in mountain scaling - most often, but not always, at the miniature size - I find I can only jump a few pixels high. Sometimes this fixes itself: maybe I won't be able to reach the currants quoins, but after falling in the ravine I can jump like a normal tiny player. But tonight I only crossed by falling in the water and flying forward over and over and over again - I couldn't jump to anywhere near the next foothold until I became large.