OleDbPermission error accessing assembly

I have just installed the .Net Framework security update and started getting the following error when testing on my development PC:

Request for the permission of type 'System.Data.OleDb.OleDbPermission, System.Data, Version=2.0.0.0, Cluture= neutral, PublicKeyToken=... ' failed.

I am receiving the error in a VSTO Add-in for Word 2007 - this add-in accesses another VB.net assembly that uses oledb to lookup information in an Access db.

Why would this suddenly appear following the yesterday's security update

I am thinking I must need to set some OleDB permission parameters or machine-level security policy in Caspol.exe (or both). Could someone point me in the right direction

Thanks.

I have re-run the Caspol command to apply the full trust to that folder and that seemed to have fixed it. So something in the .Net Framework 2.0 security update made it not recongize full trust had already been applied (I'm guessing).

Note: Tuesday's security update also had the side-effect of making my VSTO add-ins no longer load in Word 2007. In addition to having to reapply full trust, I also had to rebuild all my add-ins to get them to work again.