Theme/Skin work is undergoing, so apologies for any weird issues you may get with themes over the next few hours. This is temporary and should lead to the issues being fixed on Dark, and Light theme returning.
Update: Light theme is almost ready to bring back, there has been a php upgrade, which will improve performance considerably, however a few tweaks will need to be made this evening to allocate the memory and resources properly. Apologies for any random site errors - a couple of refreshes will fix it. This should be fixed by end of the day/start of tomorrow. I figure it's better to refresh a few times than have the site down all day. :)