Very strange, but certain Facebook notifications are coming through but without a sound notification. When I receive a private message all is fine, but if someone writes on my wall or replies to wall message, the LED will flash by no sound will happen. I'm using the new beta version released today, but this was happening with the previous beta too.
Yea they haven't fixed it yet. The "Like" notification do not come with Alert tone.
Please make sure to report all your finding at Beta. Most of them do not report the bugs found and when they release with existing bugs from beta...ppl complain.
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