what was fixed in 3.9 (508) and 3.9 (509)?

Since 3.9 came out there were 2 updates, (508) and (509). What was fixed in those updates?

Read here.


At your service: Edit: 509 addresses system freezes and BSODs some users may be experiencing. You do not need to reinstall anything. Automatic update will do this simple update for you.