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IDEA: Unless you're on Linux, download a trial copy of DW and try to replicate the problem he's having.
Tell your client to try clicking the F5 key to refresh the layout when editing. This sometimes pulls things back into line.
I still use an older version, and pages with CSS positioning can't be laid out right within the program. And you can translate SSI onto the pages, but not PHP.
I've never yet had any problems with any tables layout though, no matter the origin of the original page.