Hello Bas,
Still it did not solve the issue.
I commented all the tests from the project. Then just created a dummy test which does nothing.
Now the only part running is the Setup() which created an object of my class and Teardown() which deletes it.
When I run this, still I get a memory leak.
Then I pushed some data to the queue within the constructor.
Then I could see that CppUtest is reporting that data as leaked data.
When I have time, I will create a dummy project and try the queue and see.
Look into this when time permits.