“Due to the nature of concurrency bugs, some of those mistakes will show up only as intermittent bugs that are hard to diagnose. The developer may not be able to reproduce them.” http://bit.ly/O7siqn Bingo.
“…these were all hand-built, so you had to go through things with the other pilots and engineers like "I had this happen, and it's not in the checklist." Then another pilot would … go back and try to correlate it.” http://bit.ly/1cjIf87 On the SR-71
“Hence the Vice President would be radically unable to do anything other than to convene and adjourn meetings of the null set of all senators, which does not include the Vice President him or herself.” http://bit.ly/1cAPedb
@jeffhunsberger Crittercism also had some show-stopper bugs with their iOS SDK (web views would hang in their unit method) which is what drove me to look at Crashlytics. I also had trouble with dSYMs getting rejected on Crittercism. Couldn’t fix it.