Arachnox I can't seem to reply to your last message, or even quote it. Not sure why...
Anyway, I think you provided the wrong save. The file should be File31, not File30, because the first file in the save folder is actually the autosave, so then the first manual save will be File2, etc. The one you gave me, has for Kate's first time. Please send me File31 from your save folder.
And dammit, this autosave being File1 just gets so frustrating sometimes.
Edit: Nevermind,
Arachnox , I used the save and just fucked Kate twice, and was able to get the bugged dialogue. Reported in the bug channel. Thanks for the report and the save.