Thanks for the prompt reply, Daniel!
Re: Reducing the # of pick-list items, that isn't a viable option for me. We have a fairly long list of items for questions like "Where did you park?" and "Which building are you go to?" and we can't reduce the list. Ditto for separating into more than one survey, we need all the questions answered by the same respondent, and we can expect them to hang around while we switch surveys.
Re: Software versions, I have the latest version of the mobile app, but my desktop app was download on 23 October. I'll try downloading a new version of the desktop app and see if that makes any difference.
Would still like to hear from Ismael on this issue, given that it was a known problem that was being addressed...