I've been doing a SS type of thing, and have been trying to eat more since I started. I've always been a skinny guy, and have gained like 9 kg in the last few months, but I'm still definitely not fat. FWIW, I'm 1.94 m tall and weigh around 83 kg now.
But, one thing that's bothering me is that my belly really sticks out when I don't use my abs to keep it flat. The fat is not on the outside, but when I relax my abs, it's like I have a ****ing beer belly. I've never had this before. Now it could be that since I've started eating more, the food and milk and water and whatever are pushing my belly out from the inside? I'm sure that I don't eat as much as many of the other guys on this forum, so in that case you should all have the same 'problem'.
Here's a link to a pic; on the left I tighten my abs, on the right I relax them.
http://img194.imageshack.us/i/mybelly.jpg/
Input appreciated.