Custom CMS/BLOG URL and Facebook Connect problem

If I am using custom urls of subdomain type urls then...
If I am connected to forum via facebook login (on the top right) and browse to a custom url like http://articles.dstreetdirect.com/ , then Im logged out of facebook for those urls .... and if I come back to normal url like http://www.dstreetdirect.com I am be logged in again....

If u try to login to facebook via any custom url page say http://blogs.dstreetdirect.com/ and click on facebook button , u will be shown an error

The Facebook Connect cross-domain receiver URL (http://static.ak.fbcdn.net/connect/x...xRESULTTOKENxx) must have the application's Connect URL (http://www.dstreetdirect.com/) as a prefix. You can configure the Connect URL in the Application Settings Editor.

I think its a global problem with all forums.... or u may call it a BUG...

Plz help vbseo ....

Please check FaceBook "Like Button" being killed by VBSEO. Relevant Replacements?