Hi bemfarmer - I think that may be a slightly older FullScreen script that you've got there - that one probably doesn't work right if you've got the scene browser open in v2 (when it's in the "adjacent" mode where it is a full panel).

At one point I updated the script and the updated one should work in v3 - it's attached here.

This attached version should work in both v2 and in v3.

- Michael