A family of Microsoft relational database management systems designed for ease of use.
Pug,
Well, your code runs fine for me using Project 2010 with SP1.
I set up a simple file with 3 tasks and two resources per task. Rather than using a filter on the WBS field, I simply selected a single task in the Gantt Chart view. I used today's date for MyDate and 60 for the Minutes variable, the former declared as Date type and the second as Single type. I ran your code and then looked at the Resource Usage view which included the Notes field as a column in the view (since the note text is short this is more convenient than having to go to Assignment/Information to see the notes text). The test string appeared in the Notes field of both assignments for the task I had selected in the Gantt Chart view.
If the above simple example doesn't work for you, then you could try an even simpler test. Create a simple file similar to the above. In the VB Editor window display the Immediate Window. Execute the following line of code in the Immediate Window:
activeproject.Tasks(1).Assignments(1).Notes="hello"
Then check the Notes field for the first assignment on the first task. Is the text there?
John