This is an FYI report on a technicality that Charlie requested I post so T3G folks are aware of it.
I have an AGO web map for Maryland geology education (it's at http://mdgeoed.maps.arcgis.com/home/webmap/viewer.html?webmap=d7cfa7a928f14d89ae9556612001033b if you'd like to look at it), and as usual it begins with "http". However, my Chrome browser started inserting a "s", so the URL started with "https". Most layers continued to load, but some layers that came from the web that were just "http" layers now failed to load because once the web map URL is https, it demands that all layers used are also https. I found I could change some of my imported layers to https and they still worked, but some wouldn't work with a https URL. So the main point here is watch out
