My stomach is normally pretty sensitive -- have to wait at least two full hours after a meal to run, GU (though not all gels) predictably upsets my stomach, as do some energy drinks. But I can have a powerbar -- the original, gooey, taffy-like, not very good tasting kind, I think they're called Powerbar Performance -- 20 min before running without trouble. This might be worth a try?

Yogurt is ok for me 5-10 min before a run for easy/moderate runs, but I find it will upset my stomach if I go for a really hard, fast run.