Hey John,
I am running 2.6.4 for connect, laptop OS macOS Sierra 10.12.6, Google Chrome browser Version 64.0.3282.167 (Official Build) (64-bit). Let me know how these systems are compatibility wise.

My web survey still isn't running as desired, no bold text, and the images aren't even appearing. This is what my current published survey looks like https://survey123.arcgis.com/share/2e0b2ef993e54803b873cf7437104948 . The images and bold text still aren't appearing as desired. My survey looks perfect in the connect app though. For the image issue, setting it to medium or any other limited image size, from what I found only refers to when the surveyor is taking photos and wanting to upload them. I altered the image size and found there wasn't a difference.
Please view this link Survey123 Connect: From Connect with ArcGIS to Web Survey; bold text isn't transferring and image si... , these are my current issues with an upcoming deadline. Once again, feel free to email me, zyinger@ucmerced.edu , I have limited sources besides yourself with Survey123 Connect, it's not widely used within my University GIS team.
Again, this is what my current survey looks like, take a look please https://survey123.arcgis.com/share/2e0b2ef993e54803b873cf7437104948 . Thanks for your time and effort, it's very much appreciated.
Cheers,
Zach Yinger