Jive will not compare versions of collaborative documents when they are above a certain size. The limit is set quite low and we have a number of documents where changes cannot be tracked.
This is all down to the way Jive handles document changes in the back-end database; each change results in a full copy of the document being stored.
I propose that this is changed to a 'reverse diff' schema, where a full copy of the latest version is stored (for fast display) but only the differences are stored for the previous versions. Previous versions could be constructed in full using the reverse diffs when required.
This would also allow for RSS feeds to display the change, rather than the entire document.