Just emailed Tom as well. But just noticed after I sent email that it only happens when opening a file from Windows Explorer and an instance of C2 opens.
Link to .capx file (required!):
Steps to reproduce:
1. Open file via Explorer window (double click)
Says "A license file for Construct 2 was found, but there was an error loading it." reverts to free edition.
Open Construct 2, with open project file that was clicked.
Operating system & service pack:
Windows 7 64 bit
I have standard steam version and non steam business version on scirra account grizzly
Construct 2 version:
Latest beta R150