I just updated my Mac operating system to Sequoia 15.0.1, and I updated DataGraph to v 5.2. Unfortunately, only a few of my datagraph files would open after these changes (and they all worked prior to the updates). I followed the advice given above to download the Beta version, and that helped; I can now open ~60% of my older .dgraph files. Unfortunately, two of my larger (and most important) files will not open.
Do you have any additional advice to help me solve this problem?