It seems dolphin and zst are enemies. Only “zst” makes this bug.
It seems forum and Firestar are enemies. Only “Firestar” makes this post.
In all honesty, being Sunday (at least here), and cryptic messages do not cope, you might still get the joke and why your post had to be treated in such manner. 
Don’t be like Dolphin!
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OK so maybe it is a graphics module issue?
I mean, the zst image will last for several seconds and no other filename will do this.