Could someone please help me with a crash log? The bug has been winding me up for ages and it's got to the point where I have to admit default and ask for help! Would I be right in thinking that it cant find [NewsUnifiedFeedListTableViewController dataSourceDidFinishLoadingNewData]? If someone can see more info in the log please let me know as I'm having trouble! Also why would it not be able to find the selector if that is the problem when it works 99% of the other time? Plus is it related to: PHP: NSInvalidArgumentException: -[NSCFString state]: unrecognized selector sent to instance 0x260e50 Note that the above came from another device just in case the HEX numbers are meaningful. Plus could it be cause by the following line? PHP: [newsTabBar.button setTitle:@"View Sources" forState:UIControlStateNormal]; If so it doesn't explain the crash log as that still happened with that line commented out! Anyway, any help with the crash will be really appreciated.