I'm heading into the 3rd week of my data collection, but I'm already seeing 8 or so out of my 300+ responses with this issue. Crazy thing is, none of my questions are randomized and this issue occurs right after my Introduction block even though there aren't any branching / skip display applied to that block. This issue has caused my whole survey to not appear to the respondents, therefore left completely blank. I've also had multiple people test out my survey prior to publishing and none of them had ran into this problem until now.
Not sure if this is a Qualtrics issue, but it seems like this has affected other people as well.