Jogi has found this problem in Gehn v.7 Live! first (look here), but nobody seems to has realized it until now. Deledrius has assumed this is a problem with Jogi's data files, but I don't think so. I have explored it now -- and I agree with Jogi !!! Problem may be that it is a little bit difficult do imagine. So I have added some screenshots here.
If you have started Gehn v.8 LIve! in german (I suppose this is the case not only in german), and you are standing in front of a D'ni Imager (for example in a neighborhood) permitted to add images, then the Big KI will not open, even not with F2 key. Only the Big KI light indicator toggles. You can't take a KI snapshot, even not with F5 key, you can't create journal entries. The only thing you can do is closing the Mini KI by pressing the "put away" indicator.
Please refer to the added screenshot.
EDIT April 28th: This problem is limited to italian an german language. It doesn't exist for french and spanish language, as far as I have checked.
Note: as Deledrius has pointed out for Gehn v.7 Live here, the language support is currently spotted due to old and incomplete transations. Even considering this I found it appropriate to write this bug report.