Unfortunately, a white screen doesn't leave much to go on. You really need to turn up your error reporting and find out what error PHP is throwing. It could be a syntax error, a memory error, permissions error.. hard to say. But since it's not happening on any of the other installations, I think it's safe to say it's got something to do with your setup.
Do you have any logging set up? I can't imagine developing a website without some sort of error reporting. Do you just guess?
Well I can understand the objection to enabling error reporting on a production box, but that's why you set up logging. There should be a way for you to browse PHP error logs somehow. No one leaves errors uncaptured. That's just crazy.
i really like your image gallery extension :) - but i would love to see it showing the images with sth like galleria, because i think it would be great if there were a way of displaying the images without a pop-up... unfortunately i'm not that good at programming, but if it's not too hard to implement, i would try if you give me some starting points...
It's entirely possible. The templates that come with the ImageGallery module are by no means intended to be used in the final production of your web site. They're meant to just get you started and show you what controls are available.
It's unlikely that I'll be supporting Galleria, since it runs on MooTools. I'm much more likely to implement a SlideshowPro extension.
But like I said, it doesn't mean it's impossible for you to do it. It's actually pretty simple.