My White Labs Belgian yeast blew off my cap and covered the counter as well. I am waiting for some Fermcap-S which is supposed to help. I also ordered a larger flask (using a 2 Liter now - 5 on the way).
I have since started the White Labs Super San Diego and White Labs English Ale...neither repeated the Belgian experience (nowhere near the Belgian experience).
May be the yeast...not sure, but I am seeing the same thing.
(I use 3.5 ounces of DME per liter and yeast nutrient in each starter)
"You can’t be a real country unless you have a beer and an airline – it helps if you have some kind of football team, or some nuclear weapons but at the very least you need a beer"
- Frank Zappa