The past few days were a bit hectic...
Apparently when I was curious if our forum would run php 5.6, it broken the index of the site. Every subpage would load, just not the index.
Thanks to those who mentioned this to me, I started to investigate. Apparently This version of the forum and php 5.6 don't work well together. Some mods simply broke, including the simple theme switcher, that I unfortunately can't fix.
I attempted to upgrade the forums to SMF 2.0.15 but that made things a lot worse. Many of the mods are simply not compatible with SMF 2.0.15, so that's an even bigger set-back than what we currently have.
In the process I moved us to an isolated spot on my hosting so this can't happen again, and I have more control over what I want specifically to this forum compared to all other hosting stuff I do. A side-effect of this, is that the url has changed. We used to have nifflas.lpchip.nl, now we have nifflas.lp1.nl. The site is still the same thing, so don't worry about that. I considered trying to go back to the old url, but in the past day, I have done so many things to fix small issues, that I'm not really feeling into going through that whole process once more to set it back to nifflas.lpchip.nl. There currently is a redirect in place, but I strongly urge you to update your bookmarks to point to the new
https://nifflas.lp1.nl site instead.