IGDev
I'm currently using the latest beta r236 and I has absolutely no issues running and previewing your project.
The error you are getting is definitely a dodgy plugin/behavior somewhere on your system that is conflicting.
It may be worth uninstalling C2, deleting (or just move if you want to keep) the remaining C2 folder from Program Files (also remove files from %appdata%\Construct2\).
Then reinstall C2 and test.
I know it's a bit of a bind, but it might be for the best.