Error MAPI Proxy in PGP log

Hello.

We use Outlook 2010 with MS Exchang server and DESKTOP EMAIL ENCRYPTION 10.3.2

On some letters, not all, we see the following result:

  - letter is not decrypted automatically

  - in the PGP Log appears line: Email Error MAPI Proxy: Caught PGPSE_Exception exception in CreateDecypheredMsg. Exception code 0xc0000005
  - the letter can be read only on the PGP Viewer.

Thank you for advance.

Alexey.