Garbage collecting kernels and configurations

Hello, When I execute *PRKernel allInstances* in my working image, I currently get 4 instances, instead of one, which are mostly cross referenced by: 1) either obsolete block closures as follows: [closure] in PRContext>>activationCallback 2) or, by WAValueExpressions with #kernel as key, and aPRKernel as value (probably again related to the closure in PRPierConfiguration >> describeOn:) One of the kernels has close to 2500 references of type (1). I'd like to know if somebody else has had a similar experience, and what would be the most straitforward solution to get ride of them (and avoid this situation in the future)? FYI, I've been systematically executing *WAEnvironment reloadApplications*, which seems inefficient, since just nils the pointers, and does specifically not handle the cross references inside the configuration objects. Thank you in advance for your insights. Regards, Reza