This screen comes up blank whenever I click into the select actions to run in rule (N4).
This only happens whenever a global variable is set to a decimal by another rule (manually setting the variable to a decimal does not produce the blank screen) I'll explain in more detail:
I have a global variable (N4CM) that is set by a rule (schedule) based on a week number. The blank screen only happens whenever the global variable (N4CM) is set to a decimal by the rule (schedule), If I manually set the global variable N4CM to a decimal this does not happen and I can edit or add to the rule as normal. I can also edit the rule as normal if the rule (week) sets the variable (N4CM) to a whole number. I am not sure if the rule will run or not I will need to test, but for now it is at least a UI bug I assume. (offsetN4CM and Gal are both decimal global variables as well)
This rule is Schedule: