If is enabled link to "User hotspots"(COM_HOTSPOTS » Hotspots / Userhotspots) link Back to main page return to Userhotspots???

for example:
"User hotspots" disabled "Back to main page" return to
"/index.php?option=com_hotspots&view=hotspots&Itemid=21" but if is enabled it returns an empty user page but any user not login??? :
"/index.php?option=com_hotspots&view=hotspots&layout=userhotspots&Itemid=58"

http://www.hrs-diving.com/index.php?option=com_hotspots&view=hotspots&Itemid=56

joomla 1.5.25
hotspot 2.0.5