There is nothing else I can really suggest here except to keep physically checking your iponline table here.
The query is correct. The code definately works as seen on the examples I posted.
who's online will update as long as you have the onlinepal selected to view and to display number of viewers as posted above.
Code:
Content visible to verified customers only.
For quick reference our site is showing who's online as well here
http://www.photopost.com/photopost/index.php