Basic exceptions in Blackberry Titanium apps are causing the app the crash and fail with no error output whatsoever, making debugging and troubleshooting next to impossible. For example, take this code which represents a common mistake in Titanium development:
Ti.UI.Window() should be Ti.UI.createWindow(). Instead of throwing a red screen of death notifying me that there was a runtime exception at a specific file and line, or notifying me in the TiStudio console, I get nothing in both places leaving me with zero information to act on. If I run the exact same code on iOS, I get the following log in TiStudio and I also get the attached image in the simulator itself, making it very clear where I went wrong.
IMHO this is a very important issue that needs to be resolved otherwise developer iterations will be painfully slow and generally ineffective.