Two weeks after the release of Subsurface 4.6 we have not received a lot of bug reports -- which is quite encouraging.
One strange bug affected the initial Mac DMG; a broken support library caused crashes in some rare circumstances. This that bug was entirely in a support library, we decided to simply replace the Mac DMG without doing a new Subsurface release.
Besides that, we have fixed a few random other bugs that have been reported and are planning to do a new release in the not too distant future.
If you ran into a problem with Subsurface 4.6, now would be a great time to post it to our issue tracker, just so we can try to fix it before the next release.