One problem that has come up in the latest release is that files and folder names that start or end with a space are actually invalid (systems like Windows block creating files with such names), and Construct now enforces this too. However it means existing projects which use invalid names with spaces at the start or end cannot be opened. These projects will have also been unable to be saved as a folder project because of the use of these invalid names, so arguably they were already broken due to the use of invalid names.
To fix it you can do this:
- Open the project in the previous release r388.2
- Go through the Project Bar and make sure nothing has a name that starts or ends with a space
- Save the project
- Open it again in the latest release r397
If it doesn't open, check the browser console for error messages again, and go through and repeat this process checking for that name in particular.
If you still can't get it to open email your project to supportdlu@construct.net and we'll take a look.
Unfortunately projects using invalid names is a really difficult problem and it's very difficult to have Construct automatically deal with this. The important thing is to make sure everything in your project has a valid name, and the latest releases do now correctly validate that, so it shouldn't be possible to happen again. And if you found you were unable to use folder projects, it should work again after doing this.