[cairo] Memory leaks

[cu]

Good day!

I am using Cairo under windows, drawing into image surfaces. I have 
tested the application with Visual Leak detector and it shows fairly 
numerous memory leaks in Cairo functions, in particular down the path in 
functions called from cairo_fill, but also others (text drawing etc). 
Some of these objects appear to be ref counted. Considering amount of 
reported leaks and assuming VLD is correct (it had been so far) I wonder 
if it may be something I don't do in my code that causes memory to leak?

Is there anything aside from cairo_destroy and cairo_surface_destroy 
that needs to be done to deallocate resources?
I am using cairo-1.8.6, compiled from sources locally.

Thanks!