customers list not showing in backend after 1 click upgrade successful but 1.6.0.9 to 1.6.1.5

[latika]

Hi 

 

I have tried twice After successful 1 click upgrade from 1.6.0.9 to 1.6.1.5

 

Everthing works fine except in backend when I click customers ... it shows blank page in firefox and chrome shows server error. The address are fine. When I search for a customer it doesnt show any match

 

I asked my hosting (inmotion) they said no Apache error.

 

The customers table in intact in database

 

Please help. In meantime I have rollbacked to 1.6.0.9 as my site is live

 

Please advise as I am not able to understand what could have gone wrong.

Regards

 

Latika