I am experiencing the same issue (I have tried using each Popup Engine available).  The permissions appear to be correct on my server, based on what I've seen here.  Here are my stats:

• Custom Theme (limited use of JS, except for a few extensions installed)
• Running on Windows Server 2000 (unfortunately I can't change this, as it's for a non-profit organization that has a "managed" web server by a shared MIS department)
• IIS5.0
• Permissions for plugin directories are for the IIS Guest User to read/write/modify.

Please help.

Thanks,
Tyson

Hi!

Can you please post a direct link to the gallery?

Thank you!

The link will be: cms.ozanam.org/index.php/events/golf-classic

I need to know when you're trying to look at the site, so I can re-enable the plugin.  We need it working in the interim, so I have disabled the plugin so the rest of the site will work correctly.

Thanks!

Well, can you create a temporary item, not traceable from the menu, to see the issue in action?

I saw that you have your site under IIS, does the IIS support GD2 graphic library?

Thank you!

Now, only if you know a bit of html code, you could remove the lines of code from the sig pro, that load the mootools library. In this way you can leave your template as it.

I know a little bit of code, and I know how to comment out lines.  Could you let us know what file we need to edit to comment out the lines of code?

//edit//
I found out the true issue behind my gallery images opening in a new window instead of the slimbox popup here:  forum.joomlaworks.net/index.php?topic=1762.0

It turns out SIG Pro is not able to display properly in a module position.  I made the edits suggested in the above link and my gallery works perfectly now.