Hi there... I've been trying to implement some routines using the Boost library, primarily with the excellent RegEx library. Everything was working well enough in small tests, but when I tried running the routines on many patterns, my program would crash (it performs various pattern matching and search-and-replaces in multiple text files). I was able to determine that the crashes came on the calls to regex-related functions (though it tended to be a little unpredictable as to when, depending on the set of files I gave it). I tried changing my project settings (I use VC6, btw) to link with "debug" libraries instead of the standard ones (eg. "Debug Multithreaded"), and ran the program again, and everything worked perfectly. Unfortunately... I don't want to have my program running with all-debug libraries for performance and size reasons. However, is it possible to have my link-settings set to use standard libraries as before, but for the stuff that uses the regex library, to use a debug ".lib" file? Or... in the 'bjam' process, is it possible to say something to the effect of "when compiling the regex libraries, turn off compiler optimizations", so I can get a standard library that should work...? Hopefully that'll make sense... :P Thanks for your time, Mike.