Hello Martim,
I faced some issues in DBACOCKPIT (web page) of DB6 10.1 FP2, and fixed with 1245200 - DBA: ICF Service Activation for WebDynpro DBA Cockpit which will import a lot of prerequisite notes as well.
I do not face a hung situation of uninstall, sorry.
And one more thing, you should implement note 1456402 - DB6: DBA Cockpit Corrections for SAP Basis 7.02/7.30/7.31/7.40 after upgrading to NW 7.4.
Regards,
Ning Tong