weird URLs in Whos Online ater upgrade

I just completed an upgrade from 1.5.5e to 1.5.6a for a client. After I upgrade I usually watched the Who's Online for a while to make sure customers are able to shop and place orders. I'm noticing that many non-spider IPs on the site are reporting they are on the URL: /includes/templates/MY_TEMPLATE/images/tile_back.gif

It doesn't seem to be causing any problem in terms of customers using the site. I tested myself and visited a few pages and saw the same thing in Who's Online. I'm just wondering if something got fouled up in the upgrade process. I did make a small edit to the Who's Online code but only to change the URL for the IP lookup.

First for clarification, is the issue that MY_TEMPLATE is in the uri, or the fact that the individual line appears at all?

I've seen such a line entry if either the file does not exist or htaccess rules prevent access to the file. As the MY_TEMPLATE being there, may see that if somewhere the template is hard-coded and again because the file does not exist that the entry is generated.

Thanks for that clue. The file is in the template's default CSS file (based on classic template). I've added a rule to the custom css file to override so I'll see if I stop seeing this in the Who's online listing now.