I haven't seen version notes in TBrac, but there is a URL for them in the other CDE products as linked from the CDE Downloads page. Looking at the URLs for the other products: On a hunch, I substituted "/tbrac2006/" for, say "/bls2017/" and found a list at the URL "http://downloads.cdesoftware.com/tbrac2006/VersionHistory.txt"
The last two updates both had just these two things:
o Misc bug fixes
o Library Updates
I know there's been talk about a new TBrac product, but there doesn't appear to be any hints as to what might be seen therein, and I'm not in a position to know.
Always check, download, and install the most recent update of your software to ensure that issues may have been corrected.