Your profile indicates you're using Office 2010, not Word for Mac! Regardless, the Find/Replace won't of itself cause the tables to join. If that's happening, it suggests your tables have the 'around' wrap format. Setting the wrap format to 'None' should resolve that issue.

As for 'Replace all' not working, it does on a PC and I see no reason why it shouldn't on a Mac. Changing the table wrap format may resolve that issue too.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]