You've tried every solution in your book (debugger, Google, forums, etc.) and still haven't been able to solve it.
No you haven't. You haven't talked to any of your senior team members. You haven't taken any help from your team lead. You haven't considered the fact that if you can not reproduce the bug someone with more experience can reproduce it and assist you in debugging it.
So
Software developers: How do you tell your boss/client that a software bug is responsible for your failure to complete your part of the project?
Just don't. That is just not a real excuse. If a software bug is responsible then discuss that with your employer. You can't tell them iI could not upload a 1 GB GB file quickly because office dial-ups are slow. Instead you should tell them to get you the connection speed you need to get your job done, and then do just that. Get the job done :)
If a team member comes to me and tells me there is this bug that iI just cantcan't seem to resolve and it is hard to reproduce idI'd be more than willing to help them or atleastat least give them time on it. On the other hand, if they come to me that, no, that cantcan't be resolved because this and this tool is messing it up, i'dI'd really consider it a lame excuse. Its
It's fine if we cantcan't solve everything on our own, but itsit's not fine if we dontdon't ask for the team's or a senior's help and just downplay the bug. Dedication to resolving an issue is more important than perfection. Many a times what we consider beyond any explanation is a piece of cake for others.