So recently Twitter for Blackberry hasn't been pushing my replies to my 9900. I have the settings correct, I've rebooted, uninstalled and installed the app...running out of options!
If it's just been over the last couple days, it was probably related to the service outages. The Push APIs were disabled while RIM was trying to get email and messaging services back up.
I have only had two notifications in the last three days. Doing my head in. Have tried every fix I can think of. I presume it is a Twitter issue and not one with my device.
Posted from my CrackBerry at wapforums.crackberry.com