I know you wrote REBUILD and that is actually not what I have done (according to the IA UI).
When I hover the mouse over the gear icon a tooltip is shown with the text:
"Build (Shift+F9)
Build a full setup, etc"
That's not telling me that I'm doing a rebuild by pressing the button.
Let me teach you a lesson in how to support your customers:
When I write:
Build the project (both as a single isntaller and a web installer)
...then perhaps you should think "he pressed the arrow down button and then selected Web-deploy, the build process starts and for not known reasons, that is not a build good enough for debugging".
Have you actually tried using your own software?
Once again I'm surprised about the quality of your responses to your customers. It seems to me that you have a serious attitude problem because almost every forum thread I've read on your forums ends with the customer either getting flamed by one of your "supporters" or finds a solution him self without any help from your side, what so ever.