>>> The repositories are now ok and working. <<<
I still get an authentication request:
A user name and password are being requested by https://repository-plugtree-org.forge.cloudbees.com.
The site says: "plugtree-org repository"
Btw I use FF 5.01, but IE8 does the same.
About Guvnor and Eclipse: I installed jBPM 5.1.0 final and I tried to open process definitions as single .bpmn files (no java), since I have no projects until the missing artifact issue is solved.