I'm not sure how new of a problem this is but it was brought to my attention by someone who uses our models. On mobile browsers unless the model is full screen and landscape orientation, annotations appear like "Annotation Title +more info." When I tap on "+more info" the annotation closes rather than expanding. I've tried this on multiple models produced by us and others.
Browsers I've tested: Google Chrome on an Android system. Safari on an IPhone 6. The original complaint was from an Android phone but I'm not sure of the browser.