Q: What's the deal with the Zend Optimizer/debug_backtrace issue?

A: There are known problems with some versions of Zend Optimizer and the debug_backtrace call. In some instances, this function call will cause a segmentation fault. (More Info)

Calls to debug_backtrace are an integral part of Knickers' error handling mechanism. The information provided by this function call is used to generate various callstacks (depending on your error verbosity).

Because these segmentation faults occur only under certain conditions (see docs/knickers_vs_zend_on_dreamhost.txt) we have not disabled debug_backtrace when Zend is detected. However, if you experience segmentation faults or a "white screen of death" you may want to either run without Zend or disable debug_backtrace within the constructor of the Error class.