After a long play through I encountered a problem when I completed the research on Heavy Plasma, (the one that unlocks the plasma base defender type missile... thing.) After the research is completed and I am brought to the xenopedia page for the new entries I become unable to select anything. When I select, say the x button, the game makes the sound as if I selected it but nothing changes. I have restarted the game, tried a new save file and re-installed the game all to no avail. I also used the .bat program to clean the file, yet the problem still persists. any help to alleviate said problem would be greatly appreciated.