Troubleshooting :
The "Simulate a new user on each iteration" run-time setting distinguishes between these possibilities. When it is "ON", the Init Section should be empty. When it is "OFF", the first Web function in the Action Section probably assumes that some preparations (e.g., "login") have been performed in the Init Section. This works fine in the first iteration, but before the second (and any following) iteration, any "context" is reset, and the script may fail