Not 100% certain that configuration is the problem,
It is: the exception is thrown in the code which reads user fonts from the config file. All relevant methods on the Driver are synchronized, as well as the static image functions, they can't cause trouble any more (except being a significant bottleneck under heavy load, aka pain-in-the-ass, because you can't use the time while an image is loaded for working on another image).
J.Pietschmann
