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Install plugins. In "services" add a new device to bundled platform. Open "java platform manager", delete Java Card platform. Create a new one with default properties. Instead of one "default device" it has "Default Device", "Default Device_1" and "New Device". Every time you delete and create the platform one "Default Device_N" is added. When platform is deleted device desriptors seem to stay in user directory and may mess new platforms created with same "ant name". I am using netbeans-trunk-nightly-200911251400-ml-javase-windows.exe and java card plugins distributed 11/17.
Known problem; I have the API in place for a platform which is being deleted to clean up its other files (eeproms, devices); just have to add the implementation which will really do it.
Fixed in main/ ebfd361441de