I have Mathematica 188.8.131.52 and I've recently noticed that whenever I press the equals sign and type something like Sech[x]^2, I get the message:
I then tried other search queries, such as p^2, Hamiltonian, and 40 degrees 39'44''. I keep getting the same message, though. What's strange is that, regardless of the search query, Mathematica still correctly interprets the input. Does anyone know why this message appears? I only started seeing it a week or two ago.