Before you report a bug, please read the How to report a bug-thread.
But since at the moment there is no way to tell if it is a bug or not, you need to do some tests. A good tip for search for whatever it is that breaks your project, is to backtrack as much as you can.
- Remove all 3rd party plugins, one by one to see if it is any plugin that doesn't work with the new build. If that doesn't help, go to next step
- Disable your whole project. And then step by step, re-enable parts of your project and see if it still works.
If you find the problem, and its a 3rd party plugin, report it to whomever has created it. If its not a plugin issue and you don't seem to be able to fix it. Isolate the issue in a new minimal project as possible, save it and report it as a bug or ask in the forum if anyone can help you.
Yes, it is a lot of work, but its a good way to find any problems you might have with the project and it saves ALOT of time for both the Construct developers and the forum people that can help you.