with CrOS R64, handling of "./" paths doesn't work. first off, paths beginning with "." are considered hidden, so they don't show up in the output normally. second, showing hidden files in the browser and then trying to descend into the "." directory doesn't actually work ... the files browser treats "." as the current dir, so you end up trying to do ./././././ forever and never actually seeing the files.
probably just need to strip off the ./ path manually whenever we encounter it.
$ touch foo
$ tar cf foo.tar ./foo
$ tar cf foo.tar ./././dump.c Downloads/./././././log
$ tar tf foo.tar
./././dump.c
Downloads/./././././log