Okay, plagued is too strong a word as it's just a single case, and with the hard 'g' in plagued and the soft 'g' in plagiarism, the alliteration doesn't even work well enough to overcome this objection. But it's the best I can do today.
So yesterday I get a lovely email from a reader who had found my work in a journal and had looked me up online to read more of my poems. Which is an extremely pleasant thing to happen. And the comments from the reader are so encouraging. At the end of the email, he tells me that by the way, a poem of mine has been published under another name at a certain journal, and perhaps it's a pseudonym of mine, but just in case he thought he'd just let me know. He gives me the link.
I click on the link, and there's my poem, every word of it, credited to someone else. A year after it originally appeared under my name in a prominent journal (and after it appeared in an anthology and on Verse Daily, but before it came out in my book). So I write the journal to let them know and they very promptly write back to apologize and suggest a course of action to rectify the situation, one acceptable to me.
In the meantime, I start to worry about this same person using this poem or perhaps another of mine elsewhere. So I do an internet search for her. And here's what I find: she was an undergraduate at the time of the publication at the school that the journal hails from, and within months of publishing my poem under her name, she was in a traffic accident and died. This immediately causes me to feel conflicted--don't want to disparage the dead and all that, despite the fact that I am feeling quite violated. Well, let's just say I'm glad I contacted the journal previous to having this information. It's all just too depressing.