If you are running an application that has been invoked using the -r option and you experience a Debugger window, no symbols will appear in your walkback log.

A side effect of the use of the -r runtime option is to prevent the selector symbols from being loaded into memory. This is done to save memory (12+n bytes, where n is equal to the number of bytes used to represent the symbol) but obviously disallows the use of the symbols in such things as the walkback log.

In order to obtain the complete contents of the walkback log simply run the errant application again, this time without using the -r option.