Why does this script fail with OS X Lion?

Question

The following AppleScript has been woorking just fine ronning Snow Leopard. Under Lion only the first site is loaded and the other Safari tabs are Untitled. Does anyone know what is wrong and how do I fix it? Thanks for any help.
Hugh
---------------------------------------------------- Non-working script ---------------------------------------------------------------------
tell application "Safari"
          open location "http://www.macrumors.com/"
          tell window 1 to set current tab to make new tab with properties {URL:"http://www.macworld.com/"}
          tell window 1 to set current tab to make new tab with properties {URL:"http://www.macnn.com/"}
          tell window 1 to set current tab to make new tab with properties {URL:"http://reviews.cnet.com/macfixit/?tag=mfiredir"}
          tell window 1 to set current tab to make new tab with properties {URL:"http://www.macintouch.com/"}
          tell window 1 to set current tab to make new tab with properties {URL:"http://arstechnica.com/apple/"}
          tell window 1 to set current tab to make new tab with properties {URL:"http://www.appleinsider.com/"}
end tell

Answer 1

Does anyone know what is wrong and how do I fix it?
Actually, I don't know why your script fails with Mac OS X Lion. I can only suggest the following workaround, which seems to work properly:
set myURLs to {"http://www.macworld.com/", "http://www.macnn.com/", "http://reviews.cnet.com/macfixit/?tag=mfiredir", "http://www.macintouch.com/", "http://arstechnica.com/apple/", "http://www.appleinsider.com/"}
open location "http://www.macrumors.com/"
tell application "Safari"
    activate
    tell window 1 to repeat with thisURL in myURLs
        set current tab to make new tab
        my newTab(thisURL)
    end repeat
end tell
on newTab(theURL)
    tell application "System Events"
        keystroke "l" using command down
        keystroke theURL & return
    end tell
end newTab