I ran into this problem with Wellenreiter on 3.5.2.
Running out of memory did not depend on logging at all. Even with logging disabled, it would continue to fill up memory until it died. I could only run it for a short time before memory was exhausted.
Is anyone still maintaining this app? It should take too much effort to track this down. Unfortunatly, I don't have a development environment to do this myself.
radioz