I created a Time Since Event condition (contact open exceeds). I then created an If/Then conditional action and selected the condition. The UI locks up. If I put the same condition in a sub rule, double parentheses, it works.
Okay, I think I reproduced it by recreating the condition, and then trying it to add it to an if condition. The issue that I had is that the only option is to “Cancel this action”, so there is no way to complete the rule - is that also what you are seeing?
There is a work-around: Remove the condition. Turn off Display Current Values. Create the condition. Then you can use it in a Conditional Action without incurring the wrath of refresh bug. Display Current Values has to be off both while creating the condition and creating the expression that uses it.
Fix is in. I just have to convince them to do (yet) one more hot fix release.