I had no trouble with the slimy texture that everyone complained about when 1.4 first came out, my first few bags of 1.4 were creamy, but not slimy. But the new batch I made today had that slimy texture that everyone talked about. There were messy stringy strands that dripped everywhere as I drank from the glass, and it even felt like drinking phlegm (ugh). Please note that the method of preparation was exactly the same as before, in a Takeya pitcher, left overnight, and that the slimy bag came from the same box as the non-slimy ones.
Something the soylent team might want to look into (copying @Conor)