OK, here's a question on this /Display.template.php file:
If; after I renamed the file to "/Display.template-old.php" (my normal routine) I refreshed the forum page and it display's as expected. So, this means that when the theme didn't find it's own copy of "/Display.template.php" it then pulled from the SMF default theme file... is that correct?
So, if this is true; should the "/Display.template.php" be instaled to this themes folder, or skipped because it works without this file?
Hope that's all clear.

Ps: Thrashing around for a few minutes and not seeing any errors in the logs.