When testing Web applications you may run into a situation where the Trace window will not open for Project Methods that are called in the context of your Web interface. Even if the TRACE command is used, it will be ignored.
The reason for this may be because the "Generic Web User" does not have Structure Access You set this user in the Preferences, as shown below:
If this user is a member of a group that does not have Structure Access, then it will not be possible to Trace any code executed in the context of a Web process. As a reminder you set the Structure Access in the Preferences, as shown below: