Share your experience!
Updated my Arc to 2.3.4 OTA earlier today. All is fine apart from when having read a text message and then shortly after I go to unlock my phone, on the display it it is still telling me '1 message unread.' Can anyone advise me in what I can do from this happening as it is rather annoying.
Many thanks.
you can do this, turn off your phone -> take the battery out SIM and SD card -> press and hold the power button for few seconds -> put everything back on and turn it back on
also you can backup everything and then do a factory reset or repair your phone with Update Service
also go to the messaging app -> press MENU -> settings -> uncheck notifications -> exit and do the same and check notifications.
Make sure you backup everything
Backup & Restore app
Use this links to download the apk
http://forum.xda-developers.com/showthread.php?t=1193802
or
http://www.elita-clan.com/downloads/backup_and_restore_v010935.apkhttp://www.elita-clan.com/downloads/backup_and_restore_v010935.apkor
http://www.mediafire.com/?1n07llajeaoo03y
How to install it
You need to
go to settings -> applications -> check unknown sources
download IO File Manager
https://market.android.com/details?id=org.openintents.filemanager&feature=search_result
download the backup & restore app, transfer it to your SD card, use OI file manager to find it -> tap on it -> install it
Contacts
just to play it safe sync your contacts w/ google if you haven't already
SMS/MMS
if you don't want to use the backup & restore app then
Install "backup SMS" to back up your SMS and MMS to your Gmail
https://market.android.com/details?id=com.zegoggles.smssync&feature=search_result
or your SMS use
"backup & restore SMS"
https://market.android.com/details?id=com.riteshsahu.SMSBackupRestore&feature=search_result
or for your MMS use "Save MMS"
https://market.android.com/details?id=com.schwimmer.android.mmsextract&feature=search_result
Call Logs
And for call logs this is great
https://market.android.com/details?id=com.yang.android.ansta
send a message to yourself 
Iuse Handcent as my standard message app and have noticed that when I go into the stock message app and then exit out of it, when I go to unlock my phone after a short while the problem has gone. This never happened before the update.
well yes it sometimes happens..
you know what one time i got the notification in the locked screen "17 missed calls"
and i was like what the....then when i unlocked nothing 
its just a bug which comes then goes 
I was having the same issue and I did a reinstall of the software via Update Centre. It essentially worked although it is happening intermitantly, but less annoying that it was. With the re-install however I have had to re-download a lot of Apps and with it have to re-customize everything.
Hoping somebody can help with a notification settings I now have. I am using Handcent for SMS and previously had everything set up nicely so I received a different notification tone for SMS as well as for Gmail. I can no longer seem to figure out how to set this up again.
Initially I was getting the correct notification tone for SMS from Hancent, but also a doubled up notification (with notification tone for that) from what I assume is the core Arc settings.
This has now morphed into a double up of notifications but I only get the Arc notification tone.
Help please!
ok, open the messaging app, the one that came pre-installed with the phone > press MENU > Settings > uncheck notifications
also do this
settings -> privacy -> backup my data and automatic restore must be selected
and did you backed up everything like I suggested above? (it's easier to help you if either the thread doesn't have that many pages, so feel free to create new threads for new issues)
How to customized Handcent SMS
Open Handcent > MENU > settings > notifications settings > notification settings > notification sound -> BACK > LED settings