No, I've never eaten after, but i have eaten just before, and it really affects the 'strength' of the pill.
I had a sandwich for dinner about an hour before i dropped (a RR), and i noticed that the pill was taking a LOT longer to come on that what it normally would. After an hour or so, I had big eyes and i was clenching, but i wasn't 'flying' like i should be. I ended up taking another one, and i was fine.
But think about it - if you've got food in your stomach, then you've got to digest that, and the pill. Consequently, it will take a lot longer for the pill to dissolve in your stomach & go into your bloodstream. This will probably make it seem weaker than what it actually is, because you're not getting a high dose of MDMA in a short time - you're getting it over a much longer time.
As for eating AFTER, i don't know. It COULD have the same effect as chewing gum, where it speeds up the digestive process. I guess it would depend on what you ate and how much.
Did you think that it affected the pill?
Just for the record, I suggest that you eat about 4 hours before dropping, but no less than 3. If you get hungry in the middle of the night, order a milk (yes, you'll get funny looks) from the bar, or alternativly, a kahluha and milk (if you don't want the funny looks). It'll stop you from feeling hungry.
Hope that helps.