Memory leaks

[develop32]

Windows task manager shows constantly increasing memory usage of 
my D application, yet there is ZERO allocation done by it at the 
time. I have made a hook inside the rt/lifetime.d for 
_d_allocmemory, and I do get notified when an array or a class 
object in constructed.
What could be the source of rapidly climbing (hundred kilobytes 
per second) memory usage?