Did you set a auto-save backup file folder in the preferences section... I am not sure if there is a default backup folder... I have had several instances in which the editor crashed because of a funky trigger or data error. If you can't find a default folder remember always back up your files unless you love starting from scratch.
To my understanding.
Your trying to set up a requirement node in which the button will not show up when you research it at the building or whatever.
Typically it would look like this:
> Count Upgrade
Queued or Better.
Now if this isn't working there could be several reasons. Sometimes when you copy and paste requirement nodes the editor does something funky and an error occurs. It's always best to create new nodes from scratch as opposed to using the copy and paste function. Try to create a brand new node.
There could also be an simple error in your research ability. Check to see if the proper upgrade is set under the upgrade option.
Also make sure the requirement node is under the (SHOW FOLDER) Not the (USE FOLDER)
Now in order to Make an ability require an upgrade you need to create a Use Upgrade requirement node in which typically looks like the following: