Hi Jon,
Yep sure is! I'm thinking I'll just upgrade to 4.1.8 and copy the original html_cat.php from the original dist.
I don't know what else to do. I manage 3 sites, 2 running 4.1.7 and the other still on 4.1.6.
The one running 4.1.6 is fine but both 4.1.7 sites have the double slash. I checked all config and html_cat's against each other and in the areas at the top of each file where the catalog directory is called from, they are all the same "".
It has to be a 4.1.7 bug, I mean the sites still work fine but it looks untidy, so I guess it's off to update
thanks again for you reply, unless you can think of any other reason this may be happening.
regards
beetlejuice