S - Timers would sometimes report people lost on time, when in reality they had plenty of time left. C13,S - Scoring system would be confused by some seki positions and mistakenly count seki eyes as points when using Japanese rules. C13 - Offline SGF editor was completely broken when in scoring mode. Still may be a few issues, but much better. C13 - Popup menu for timers would appear in the wrong place, often making it unusable.
Some people report occasional choice format errors.
Not fixed, but the place where the error shows up has been instrumented so that when it happens, the error dump will tell exactly what was going on. Hopefully this will lead to a fix. S - Server dumps sort information as it saves SGF files, quadrupling the size of the server logs. This info was never supposed to appear. Fixed in server.