Can you share the script you're using?
{pick {sprites-named wallFull}}{transform-sprite wallEmpty}{/pick}
{pick {sprites-named blockFull}}{transform-sprite blockEmpty}{/pick}
It's supposed to help with screen transitions (because whenever I press the switch, the block flip to their "wall" sprites, and vice versa, but this doesn't seem to occur for sprites outside of that room with the switch, so they stay in their "wall" forms even if the switch has been flipped).
Not even the simple "Hello World" script would play though.