I don't think I'll be much more help. I'm no programmer. There is one more operational step you could take, which is to run pkg_check(8). If the problem is caused by something in /usr/local which should not be there, or some other damage or leftover cruft is getting in the way of proper operation, this may cure it.
If not, and if no one else jumps in, you could post an informal problem report to misc@. And of course, if you don't mind reinstalling, that will likely be a useful solution.
All that I can determine is that:
- The chrome error shows a problem in libc, called through libX11. You're on the correct major/minor of both. The failing library call was to _fmt, which stopped the program due to a missing variable. The call came from libc's wcsftime.c module, last updated in 2015.
- The xfsettingsd error shows a problem with the address values passed to devel/glib2, in its gio functions. You appear to have the correct version of both libglib and libgio, too.