Will not autofocus (by 3 users)

Hi There,

Auto Focus focus ring is not rotating.

I have been using a Tamron 28-300mm F/3.5-6.3 LD Aspherical(IF) MACRO (Model 185D) lens with a Canon Rebel 2000.

Thing have been working fine until the last time I used the lense. I can only take pics with manual focus. When I Zoom, the Auto Focus focus ring is not rotating when I press the shutter button.

Normally the autofocus focus ring should rotate and a clear picture is visible when I press the shutter button.

I tried with other lense it works fine.
Any suggestions and help?
Thanks in Advance.
Ramesh
mail me bhprk@yahoo.com, "bhprk at yahoo dot com"

I had the same problem with my Digital Rebel and the Tamron 18-250mm.  I sent the lens back  and am hoping the new one doesn't have the same issue.