Could be a few things. Do you usually have things against those walls? Is it an open area or do you have a door? You could try cutting a hole in the wall and door (if you have one) and put a vent cover over it to help with air circulation. Or it could potentially be caused by no DPC.
It does work. But be careful how much you put in, especially if only mixing a small amount of plaster. Went solid half way through mixing with me before!
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