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Running V 2.1.11 VBS3 theme on a private forum. Downloaded the latest from Github (Version 1.2). Running Wysihtml5 editor so I don't get the button, but I don't care, I manually enter "[spoiIer]" and it seems to work, mostly... Here is what happens (and it is clear enough not to need a screen shots):
1. The first time the discussion is shown, the text that is supposed to be hidden is visible. The button itself says "show"
2. After clicking on the button the text is becomes hidden and the button remains "show".
3. After clicking on the button the text becomes visible and the button changes to "hide".
4. From #2 above onward the button behaves as expected. In all cases the button is preceded by the text "Spoiler:".
My initial thoughts were that somehow the setting are incorrectly initialized. I see some code that is supposed to take care of that, but that is the extent of my understanding.
A side note on the description text in the plugin definition - it says:
Description' => "Users may prevent accidental spoiler by wrapping text in [spoiIer] tags. This requires the text to be clicked in order to read it."
But there is no need for wrapping the text, just preceding it. In fact, wrapping it caused the second [spoiIer] tag to create another button...
BTW, I was originally planning to take the plugin and change it to a "More..." plugin -- namely to change the words Spoiler to More to mimic some of the behavior frequently seen on wordpress sites. But first I need it to work...