Unable to edit a large script under 3.9.9f

Since upgrading to 3.9.9f of Watchmaker Premium I am no longer able to edit the scripts for my Orbital Weather watchface within Watchmaker. Admittedly, it is a *huge* script, but I did not have this problem with previous versions.

I am able to edit smaller scripts on other watchfaces.

I had to unzip the watch file and edit the files with a text editor to make further modifications to the watchface.

Can this please be fixed?