I've run across two major bugss since updating to v1.31. I have no idea as to what chain of events led to these glitches appearing, as they both have been in the later game when there's been too much going on to attribute them to anything in particular.
In the first glitch, which has happened a few times in different games, my economic stats will suddenly go haywire. The latest occurrence was: Income 6656 BC, Spending 3221229461 BC, Net 1073711882 BC, Approval 0%. Then, just as suddenly a few turns later, it will go back to normal, except for a treasury of -2000 BC. Then, a few turns later, it will go haywire again. This cycle continues ad infinitum.
The second glitch, which has only happened once to date is research bug. It happened a short time after the latest economy bug that I described above. All unresearched technologies suddenly appeared with a research time of one week. Additionally, if a technology was researched, all technologies on that particular branch were made available. For example, I hadn't researched any Mass Driver technologies and Mass Driver Theory (along with all other techs) had a research time of one week; when I researched Mass Driver Theory all Mass Driver techs up to and including Black Hole Generator became researched and available in the Ship Designer. I suppose this may have to do with having the 3221229461 BC spend with 60% going into Research... A further issue is that although the same thing occurred with the Research techs, taking me from Neutrality Learning Centers all the way through Technology Victory in one week, there was no technology win.
I have screenshots of the economy bug but, don't know how to post them...