I just downloaded Fritz 16 myself this weekend and experienced the same problem when trying to play a rated game with 45+45 time controls. I figure I must be doing something wrong or it's a software bug that needs fixed. Unfortunately, I didn't have time to explore whether or not I may be doing something wrong when trying to play a rated game with longer time controls. If I find something out I will add another post but I likely won't get to play around with it for a few days.
Work, wife, sleep and no time for chess much during the week.
I don't know where to put this so I put it here. Has anyone used Fritz 16 yet? I've got a problem and I went to Chessbase support and they wasn't really helpful. Evertime I try and play a rated game with the engine, when I select time controls it gives me 10 seconds and won't let me change it on the clock. No matter what time I select it gives me 10 seconds on the clock. I don't know what option to press or what button to press to change it to the time I want to after the fact. I've got Fritz 15 and it works fine, but I wanted to use the new features of Fritz 16 and I just feel I wasted my money.