"Unable to load DLL"

I updated to 3.17 of Password Safe today, and I get the following 
message on starting it:

   Unable to load the necessary DLL to support Autotype during Launch of
     a Browser or Run a command
   Autotype for these functions is disabled.

Browse and Browse+AutoType seems to work whether or not my browser is 
started, so I'm not sure what the message means.

What do I need to cure this?

I'm on WinXP SP3 with FF3 as default browser.

David

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