Joomla release 3.7.2 appears to have broken the menus
I'm curious if you've checked the civicrm log file. Might help to confirm that it isn't reporting any problems due to permissions. Other than that, might want to take a glance at https://wiki.civicrm.org/confluence/display/CRMDOC/Moving+an+Existing+Installation+to+a+New+Server+or+Location. Its possible you may need to rebuild the menu for some reason. I haven't updated to 3.7.2 yet, so I can't confirm this issue myself.