I have recorded bunch of transactions and grouped them by adding containers. Script was executed few time and everyhitng was fine. After few days, I have opened the project and found that most of the containers are empty!
Not sure what caused the issue and like to know the cause and how to recover the lost or missing transactions.
When you say most of the containers are empty, do you mean that some of them still have some pages/requests or everything is gone even the virtual users?
It might be possible that everything disappear but it will be quite strange that only few elements are vanished.
Have you really opened the right project and not a backup that is not in sync with your last update?
You can check the NeoLoad log files to see if there's some relevant information. They can be accessed through menu "Help-->Open logs folder..."
Otherwise, you can still recover an old configuration for your project in two different manner:
I hope that it will help you.