Hi Nikolov,
Actually we use the tag to compare and we figure out which tag to use based on the version. If there are no tags, then we'll use trunk.
So if the developer is behaving properly and tagging each release (and then not adding to that tag, but adding to trunk and creating a new tag for each release) our system works great.
The problem arises when developers check code into tags.
Can you tell me which plugin versions and what differences you're seeing?
Regards,
Mark
PS: If you found this helpful, please rate Wordfence 5 stars.
http://wordpress.org/plugins/wordfence/