When the snippet is released onto the drop zone, nothing happen and my action set will not appear.
Is this for any snippet, or one in particular? Has it worked in the past?
Yes this is for any snippet, and it didn't work in the past. I'm using IE11
Do you have the option of using a different browser and seeing if it works there? If not, you may want to reach out to Nintex Support and open a case with them. Submit a Support Case - Nintex Knowledge Base