I see it in that capx too. (only that capx)
I tried the Capx, shrunk the browser to a small size and I get an error in Firefox and requires forced shutdown:
localhost/glwrap.js, line 1366 (col undefined)
This is either a bug in Construct 2 or a problem in a third party plugin or behavior - please report it to the developer!
In Chrome, the browser goes black, no error. but will close down fine.
In IE it works fine, as expected. (surprised me too.)
My games size fine in all of them. My graphics card is up to date.
Edit: just realized, the error says GL wrap, so no wonder IE works.