I noticed that when working on databases with a large number of scripts. If I expand the script name area to show long script names and then scroll down, the script names are blank. If I switch windows, click out side of FileMaker or change applications the script names appear immediately. If I just let the script manager window sit, the script names don't appear until I change windows. Please see the attached images for an example.
This in FileMaker 18.104.22.168 and earlier versions of 15. I have had this occur on a new Mac Book Pro 2016 running OS X 10.12.2 and a Mac Book Pro ( 2012 ) running OS X 10.10.5
Closing folders so that less script names are available resolves this. Files with fewer scripts do not exhibit the problem. This is minor issue, but thought it was worth mentioning.