Can't get normal display.

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I'm working on my very first site and am using  Adobe GoLive 6.0 .
One of my pages displayed fine in normal viewing mode but now all I
view is the source code, not the way it would (more or less) actually
look in a browser.
Should I look at the code to see if any basic tags are missing and /
or if they're not closed / in the right order?

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