Selecting a Quickparts field in WORD disables other commands

Our company has chosen to use SharePoint and to add the SharePoint version number to our WORD 2010 documents as a Quickpart field (document property). This works OK.

However, when you select text that contains the field, numerous other WORD commands are disabled. For example, I use Ctrl+A then F9 to ensure that all the fields and cross references in our docs are properly updated, but F9 no longer works if the selected text contains the Quickpart field. We also have documents where the field is included as hidden text. If you want to unhide the text, CTRL+SHIFT+H no longer works and the whole of the "Font" command group is disabled. We use this section of the to record comments and responses, so we have a full audit trail within the document.

Don't know if adding any other field to a document has the same effect.

My question is, has anyone else experienced this and is there a way of stopping the "disable". This affects around 50 people, so a solution would be good!!!

Thanks

Simon