Product and version FM Pro Advanced 15v01
OS and version - Mac OS X El Capitan, Windows 7
Hardware Mac with VMWare
A graphic object that has hide object logic associated with it loses the ability to see and access that logic after you attach a script to the object. Removing the script does not make it reappear and the logic continues to operate regardless. Worse you can add another calculation and it shows two hidden object icons and does not override the hidden logic.
There is an attached file demonstrating this bug.