Unable to modify Flow in Builder

Hi,

I am new to PsycoPy and it seems like a good tool to create stimuli in a project I participate in.

My environment:
Windows 10 64 bit
PsychoPy version 1.85.6

I’m trying to modify the Flow in Builder - it works fine on a Win 10 computer version 1.85.4 but doesn’t work on another with the above version.