Object caching in a mod_perl application

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I am seeing a symptom that I have seen discussed on this list and would 
like some help tracking down the cause.

I am using apache, mod_perl and mason with CDBI 0.96.

What the application is doing is taking an input from a html form, 
updating the appropriate object and then performing a redirect:

  $obj->$column( $date );
  $obj->update;
  $m->redirect( $redirect );

The redirect typically goes to a page displaying the data in something 
like a table form.

When the object is displayed it can display the data prior to the update 
(although not consistently).

My understanding so far is that this may be because a particular apache 
process has the CDBI data cached. I've seen from the list archives that 
this shouldn't happen. A post I have seen suggests that there is a scope 
problem with the code.

This is as far as I have been able to get in tracking down the cause of 
the problem. The only globals I am using (set up in apache's httpd.conf) 
are the database handle and one for a CDBI user object.

Are there any suggestions as to what I might be doing wrong or further 
information I could provide to help identify the cause of this?

Apologies if this is OT for this list, but I had seen it discussed here 
in the context of CDBI caching.

Thanks,

Jim Mozley