Hi everyone, Has anyone had any trouble with NSPredicate causing occasional crashes when used with NSArrayController? Well actually about 50% of the time. What I have is a subclass of NSArrayController which is a data source for an NSTableView that accepts drag and drop operations. In 'awakeFromNib' a NSPredicate is defined, sometimes the error is just, “EXC_BAD_ACCESS”, other times there's a bit more info: data_source.rb:20:in `awakeFromNib': NSInvalidArgumentException: Unable to parse the format string "AND" (RuntimeError) This is the offending line: @filter_predicate = NSPredicate.predicateWithFormat("file_type == 'NSFileTypeRegular'") The crash doesn't always occur, when it doesn't my app works without any problems. I've tried the predicate in macirb and the crash doesn't occur!? Best regards, Alan