If you have a spoiler in your post, and click 'Preview', the spoiler won't open when clicked on.
I've personally known about this for a while, and would love to see/know a fix for it.
I've also experienced this problem. It's been there for a long while, but it never really bothered me.
I've known about it for awhile too, but I figured if I never said anything, it would never get fixed.
This has nothing todo with our website or forum. It has something todo with your computer.
I cannot help you with this. We tried to get the error and nobody of us manage to get it. Not with Firefox, Not with IE and not with Chrome.