Hi guys. I have spent several hours trying to find a problem with Fuel and RPackage and I couldn't. We have a test where we create a package, we create a class and we compiled some methods. Then we serialize the package, we remove it, and then we materialize it. In a clean Pharo 1.4 image this works PERFECT. No problem. Now, if I run it in the Nautilus image (where RPackage is loaded) I have lots of problems. I am completly lost of what is happening. But it is reproducible. So I really appreaciate any help. To reproduce: 1) Take a Nautilus image from: https://ci.lille.inria.fr/pharo/view/Nautilus/job/Nautilus-Release/ 2) Install Fuel: Gofer it url: 'http://ss3.gemstone.com/ss/Fuel'; package: 'ConfigurationOfFuel'; load. (ConfigurationOfFuel project version: #bleedingEdge) load: 'DevelopmentGroup'. 3) Open a TestRunner and just run the test class FLPackageLoaderTest. Once that finish, you will have like 20 debuggers opened. In addition, like 4 error test. Without Nautilus I have only ONE red test and no debuggers. The debuggers are all in the line: self flag: 'should not arrive there now'. self halt. from CompiledMethod >> packageFromOrganizer: Thanks for any help, -- Mariano http://marianopeck.wordpress.com