It just started recently and not sure if this is related to a control room update going on. I have been copying bots a lot in the past and never had a problem.
Here is the simplest way that I can reproduce this all done in my private folder on A360 :
1. Create a bot with only one action (i use message box)
2. Copy the bot
3. Open the copied bot (this fails) looks at following screen. I turned on login on the AA extension which shows a 403 error (not sure if it is related)
