exactly(n) function in JMock

Hi,
I am facing a slightly weird problem. I set an expectation as

exactly(n).of(<mock-obj>).f()

Bug
Suppose the function f() is called 5 times; For any n < 5, the expectation fails. However, if I provide the value of n > 5, it passes for all!!
Eg: exactly(100).of(<mock-obj>).f()
The above expectation passes, even though the function f() is called only 5 times!

Any thoughts ?

PS: The expectation is under a context and the syntax is perfectly fine. In short, the java file compiles fine!

-Vivek