I've waited a bit to ask the question, but I've noticed that since patch 6, the number of critical misses is quite a bit higher than the critical hits. It doesn't matter, btw., if karmic dice is enabled or not. The setting seems to have no influence. I still get the latter, but the number of critical misses is far higher - at least 2 to 1, probably even higher. I 've playing RPGs long enough to be aware of the confirmation bias, so I tried to make sure that it just isn't my impression, but an actual fact. As an example, during a string of about 15 or so skill checks yesterday I got three 1s (and two in a row), but no twenties. Now the obvious answer is of course that RNG is RNG - this just happens. And I'd agree, if I hadn't seen something like this happen frequently since patch 6 hit.
I'm curious if anyone else have noticed this since patch6. I know the quirks of RNG, so I am very hesitant to say that this is a bug, but it is a noticeable derivation.