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In certain situations two candies at the bottom of the playing field compete to occupy a vacant square. They rapidly alternate and the game can't be played whilst they compete with each other. It's happened to me several times. Can the glitch be addressed pleased? I'm playing on a PC.
I haven't seen anything else on the site about this bug. I just checked my game for you and level 502 is working just fine. Possibly a browser issue? Clear your cache and maybe even try another browser, see if the level plays okay.