I've had problem with Belgian Wit yeast several times. I've since learned to make a good starter for that yeast. I have a batch in the closet that I brewed on Saturday. Saturday night, after I got home from the brewing downstate, I pitched a huge starter that I had stored in the fridge. NO airlock activity. I am giving it a bit more time, and upping the temp just a bit. I fully expected the yeast to take off like a motherfrakker, but maybe something happened to it.
I'm not worried. As long as the pail is sanitary, I have a couple of days to figure it out.
if I open the lid, there is a lot of foam. Don't know if this is krausen or just foam from the aeration and drive home, The smell is very hoppy (yum) and even some CO2 burn. I'll keep an eye on it and see what happens. I didn't take a gravity reading, as brew day was very hectic, but I can take a sample and check it over next 3 days.
Point is, keep clean and you are likely good to go.
Day after day, it reappears. Night after night my heartbeat shows the fear. Ghosts appear and fade away. Come back another day.