Hi Justin,

Apparently this is a bug in AutoCAD for Mac.
If you will look at the command prompt (in both AutoCAD versions - for Mac and for PC), you will see that picking on the link in Balloon popup calls "-XREF" command with "Reload" option. In both versions an * used for Xrefs names, but on PC the result is more intelligent - it reloads only Xref which was changed and on Mac it reloads all Xrefs.