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Thanks to Blue_Hedgehog who posted this on Use Boxmen: If you can't move then you're probably using Chrome. Some new update seems to have messed with it. Type About:plugins into your address bar. Then hit details. (Click Show Detail+) And disable the flash plugin thats in the Chrome Directory.
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Instead of rainbow gems being wasteables, how about making rainbow gems be permanent (having one meaning one use on every map), but progressively increase costs to unlock them. First gem could be unlocked by 6 stars, second by another 12, third for another 24. That way you could have 3 gems at the start of the last level, but still have your fun experimenting with them on earlier maps.
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Just got my first rainbow gem, though reading that you'll permanently lose them once used, i wonder why i should ever waste one before the last level. Instead of giving us something to experiment and toy around with, it seems to be just a one-shot wasteable resource.