Upon opening any file (provided datasets, files from Adamic's SNA course or GetNet generated Facebook graphs), right after loading the data the graph window, which is surely open and appears to have the icons at the side and bottom, stays gray and upon hovering over it with the mouse, the Windows 7 loading icon (blue ball of death) is shown.
The other windows all work and display properly. The program works on the data and delivers consistent data that are properly visualized in the preview window. Also all Layouts, Rankings and Partitions are properly visualized.
The machine I am working on is a HP Laptop with i7@2GHz Intel Processor, ATI Radeon HD6770m, 8 GB of RAM, Windows 7 64-bit, Java 7 Update 45 (build 1.7.0_45-b18) installed.