2.49.5 x64 Lightning not laoding

[Rob Steinmetz]

I'm not sure what I've done, but in my profile SeaMonkey 2.49.5 x64 
Windows 7 is not loading Lightning. I've deleted the previous 32bit 
versions and and installed SeaMonkey x64 downloaded from the official 
website both as Administrator and as a user and when it loads Lightning 
is not present. There is not Tasks and Events Menu.

Any ideas what could be wrong?
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