Hello, new to the forums, have been looking for a year or so and finally decided to start posting!
I have a Curve 8900 and love it!
My first problem occurred last night when i started to receive my E-mails and facebook notifications twice. I don't receive SMS messages twice though.
Do you mean that you're notificatuons appear in you're inbox and in the facebook app?
If so, open fb, select options and uncheck 'blackberry message application'.
Hope this helps.
Posted from my CrackBerry at wapforums.crackberry.com