The F9 version available for download on the Blackbaud Support website (compatible with office 2010) as of October 2011 is:
Excel F9 Client    4.2.8.5
F9 for FW             4.2.0.1
F9 Server             4.2.0.2

The previous version, which is not compatible with Office 2010 is:
Excel F9 Client    4.0.9.6
F9 for FW             4.0.6.5
F9 Server             4.1.1.3

When there are any issues with F9, it is imperative to check the version through the Spreadsheet , F9, Version.
It is possible for a client to have both versions installed on their system, but F9 is linked to the correct version through the add-in.
It is also possible to have individual workstations linked to different versions when not all users were updated.

There is an updated version on F9.com, which is similar to what is posted on our website, but it addresses issues a client was having with incorrect data items pulling to their spreadsheets.  Very few clients are using this functionality.  After the client is using it and has confirmed all is well, we will post that same version on the Blackbaud downloads page. The version available from F9.com, under Downloads, Blackbaud, F9 Version 4.2 For FundWare is:

The F9 version available for download  on F9.com as of October 2011 is:
Excel F9 Client    4.2.8.5
F9 for FW             4.2.1.0
F9 Server             4.2.0.2

If The 4.2 version has already been installed (which required a serial number and activation code), those numbers will not be requested again on upgrading to the F9 for FW 4.2.1.0 version.  Detailed instructions on how to upgrade within Version 4.2 can be found on How To Update your F9 V4.2.