Thanks to mohan_168 in the BPN for this.
Adobe have released an update for their Acrobat Reader software. There is no changelog available at the moment. You can download the patch from the link below.
The Adobe® Reader® 6.0.2 update addresses multiple known issues in Adobe Reader 6.0, including support for forms that use Adobe"s XML forms architecture, creation of barcode-enabled forms, and a security update.