Having problems with the functionality - no opendir file, and internal error message when previewing

Page ref: http://www.sallycox-stainedglass.co.uk/Stainedglass.php

I have uploaded and installed successfully. I've used Powergallery before so OK with it normally, but am having errors this time around.
1. It's giving me an error message looking for file named opendir. I can't locate it anywhere on the server.
2. If I try to preview a gallery style, or click the link instead of embedding the gallery directly to the page I get an 'Internal Error Message' - misconfiguration.

"Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request."

Thanks in advance for your help...

I'll need to troubleshoot directly, see the private message section.

Many thanks for your reply. Please see Private message for the information required.

I Updated the gallery/admin/common/functions.php page to fix the error message on the gallery pages, and updated the permissions for the gallery folder and all subfolders/files to 755 to fix the problem on accessing the gallery directly.

The gallery will resize images, it looks like you may have some images that are smaller than the gallery size, this causing them to look a little blurry when resized.

Many thanks. All looking good and working well!

You're welcome.