Column 1 Column 2 Column 3 Column4
2RedBlueGreen
3RedBlueYellow
4VermillionCobaltCitrine

Oh, Oh! I think I found my errors! I was using the first TABLE tag on its own line. So the table above looks like this in the BBcode markup:

PHP Code:
[TABLE]Column 1 Column 2 Column 3 Column4
2
|Red|Blue|Green
3
|Red|Blue|Yellow
4
|Vermillion|Cobalt|Citrine
[/TABLE