Too many broken spoilers on the forums. I must make step-by-step guide for fixing them. My last forum formatting thread touched upon this, but I'll make this a little more in-depth. If you see broken spoilers, just refer people to this thread. --- So you want to create a spoiler? You write things like a normal person and it'll all work out. Now, if you're someone like PandasEatRamen, you'll run into a few problems. Why? Because you have a modifier on the spoiler itself. This is a bad idea, don't do it. XenForo's rich text editor loves to throw unnecessary tags on everything. Every line gets a modifier, occasionally doubling them up in crazy ways. Because of this, modifiers are very hard to get rid of. The best way to use the spoiler tag is to use it before you do anything else. If you know your post will contain a spoiler, put it there. Later, when editing your post, just avoid the spoiler tag like the plague. But wait, you already edited your post, didn't you? Your spoiler tags already have modifiers on them. That's not very good. Well, how do you fix that? Every time you get replace the spoiler tag, the modifier remains. This is when you dump the rich text editor and delve into that unknown territory touched only by Crazy1080, the standard text editor. It's a scary place, so be careful. Comparing the two standard text spoilers, the second one has the modifiers inside the spoiler, while the first one (the bad one) has the modifier on the outside. It's a pretty quick fix to click&drag the modifier from the outside to the inside. This will work every time, assuming you're using the rich text editor in the first place. If not, there is another fix, which I will show below... but I'm the only person who even touches the standard text editor. See that? There is no modifier placed precisely on the spoiler tag. It should be okay, right? Well, it's not. The spoiler tags are still being modified! That's unfair. How do you fix it? You need to isolate the spoiler tag and make everything good again. As you can see, the spoilers are now surrounded by an absolute mess of additional tags. On the outsides, I have tags to remove and later replace the color/font tags. On the insides, I have an isolated color/font modifier that begins and ends inside the spoiler. It looks confusing, but it also works, so it's okay. If you happen to have any further questions regarding spoilers, feel free to ask, but this should be comprehensive enough for most people. Stop worrying about "the spoiler curse" now, because that's just silly. Did you expect something about the eraser button? I've tested it out. It doesn't always work, so I don't tell people to use it.
I have actually used the standard text editor myself for fixing multiple spoilers. I realised for fixing them, you had to highlight the text you need for the spoiler (including spoiler tags), cut it (Ctrl-X) then paste as plain text (Ctrl-Shift-V) back where it used to go.