I know the title isn't all too descriptive but I don't have a better way to describe it. Whenever I open a file with vim (but interestingly not nvim), a bizarre sequence of characters shows under the cursor until I take my first action in the file, at which point it disappears, revealing the content that would ordinarily be there. Here are a couple pictures that show the issue better:

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ericmarkmartin
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vimrcin your question might be useful. – statox Jan 11 '18 at 07:41