Hello Rango
Oh, bugger. I didn't see that you also have a module without phoca. And I'm even in the wrong topic now. Double-bugger...
Could you move this please?
Anyhow, I've installed "Vina Awesome Image Slider for Phoca" which makes this problem.
Just to sort the problem out, I've installed now the "Vina Awesome Image Slider" too to show if this would work and it works on all pages. So It has to do with the phoca module.
I've sorted out now that it is a problem with the line "$files = JFolder::files($dir);" in the function "loadEffect" in helper.php.
If I comment this parts for file-enumerations etc. out and set the effect script manually there (e.g. "$doc->addScript($dir . "script.js");") , all page do work as expected and there is no more internal 500 server error.
That all really makes no sense to me. And actually, this is the only module with this problem. All others do work, including the Phoca-less module of this slider, which includes exactly the same function...
But anyhow, maybe it helps to solve the problem.