Still opens OK here... (remember to describe exactly what you're doing as well - I just clicked the link and Construct launched the file, I didn't try the method you used at first)
Try deleting the .persist file with the same name/location as the .cap. Or, load the .cap, and the project bar might have loaded it with all layouts closed (so it has in fact loaded correctly but only populated the project bar, double clicking a layout will open it)