I have recently upgrade to blackpearl 4.5 1230

Since doing this, users have been complaining that when they open a task, and then complete the task, the window that the form opened in no longer closes, but rather redirects back to the home page of the site that the form opens on.

So the scenario is:
I have a central task list where users go to view all of their tasks.
Users click a task to open it, and a new browser window pops up displaying the infopath form in a web page (using infopath forms services)
The task is completed (the form is set to close when the task completes)
The window does not close, but rather is redirected back to the home page of the site on which the form was opened from.

Has anyone else encountered this, and if so, can anyone tell me how to change this so that the window closes after the task is completed.

Thanks in advance!