Even on SS it takes about 24 hrs between approval and selling to start. I have not noticed the same thing on IS. It does tend to start slowly but I recently had a new file that got approved and within 6 week is close to 200 downloads, so it must have shown somewhere...
On stockxpert definitely there seems to be a big gap between customers seeing the files (or not sure how there new search routine works.. Surely you wouldn't people to only see older files??) and the approval