This has been bothering me for a while, but anyone that have issue with the scroll bar that disappear randomly in the script editor? When the scroll bar disappear, I can't scroll through my script using my mouse. I can still navigate the cursor using the keyboard. (Up/down) In order to get it back, I need to close and open the script editor.
Hard to say if it is a bug or not, it could also be issues with your computer. Does you comport meet the system orequirements? When does this happen, is it when you have high loads on your system RAM/CPU? Is it only you on your computer who are experiencing this or are more computers/users experiencing this issue?
You could contact support for this, but if this is a bug they will most likely ask you upgrade to a later version before moving forward registering it to their product developer crew.