Run button non responsive

[eleanorjboyd]

Clicking the run button is non-responsive, meta issue as a few separate people have reported this problem

[eleanorjboyd]

The run button was broken (didn't do anything on click) until you uninstalled the Python Environments extension
#628

[cwebster-99]

potentially related #644

[eleanorjboyd]

havent see this in a while- going to close as it seems resolved.