On new or existing Citrix XenApp 4.5 servers, I am having problems streaming the Allscripts Pro EHR application via the XenApp web interface.

When users launch the application via the Citrix XenApp web interface, the application does not have focus, preventing users from typing in their username and password. If they use their mouse to select either the username or password fields, they still cannot enter any text.

However, if they do any of the following actions, they can then enter in their username and password and the application runs without problems:

1. Click on the Login button with empty fields. Logon fails but they can then enter their credentials.
2. Minimize the login window and then maximize it. They can then gain keyboard focus to enter their credentials.

What might be preventing this particular application from having focus when it launches?