Curious… I bought a complete new host at a2 hosting since the other one was pretty slow… exactly the same problem…
then I deleted all the menu’s and tried to use firefox instead of chrome to import the demo content… It run for a bit.. I checked and all was fine.. but then I noticed the loding graphic going on again.. I checked again, then double the menu’s.. somehow adding the menu’s is stuck in a loop
Probably does not make much sense so I recorded the installation from the start.. at the end of the video you see the bug I encounter.. the import page looks like it is auto renewing after it says it is done..
http://youtu.be/N8vVI-HKIes