Sorry it's taken us a while to get back to you.
Would you mind letting me know which version of ShinobiCharts you are using? NSLogging [ShinobiCharts getInfo] should give you it.
From what you've given above, I can't see why you should be getting a black screen. Is there any chance you could manipulate our CandlestickChart sample project to replicate your issue to email@example.com quoting this forum post?
Doing a similar thing in the sample seems to produce what you'd expect and doesn't result in a black screen (using v 2.7.3.hotfix2-3 )
// Replace Candlestick Sample xAxis creation code with the following
NSDateFormatter *cutDateFormatter = [[NSDateFormatter alloc] init];
NSDate *cutDate = [cutDateFormatter dateFromString:@"20-01-07"];
SChartDiscontinuousDateTimeAxis *xAxis = [[SChartDiscontinuousDateTimeAxis alloc] init];
xAxis.title = @"Date";
SChartRepeatedTimePeriod *weekends = [[SChartRepeatedTimePeriod alloc]
initWithStart:cutDate andLength:[SChartDateFrequency dateFrequencyWithDay:2]
_chart.xAxis = xAxis;