Something wrong with these .htaccess rewrite rules?

[Max Taxable]

Is this the free version or paid version of DBSEO?

The free, "Lite" version. I have it running without much hitch on two other of my sites.

Is your forum within a forums folder?

Now that's a interesting question because technically I suppose it is. The domain points to a folder in the file manager but the folder name isn't part of the URL. This might possibly cause a problem with rewrite rules, although for years i have successfully had the forced www rewrite rule in effect with no issues.