In my last game I got the 'your people love other cultures' event, which weakens your influence production. The culture border between many of my worlds and the backward Drengin was one square away from the planet itself, and a few were just inside.
This is neat and all - I've had the event before, and it just leads to a tense few years - but in this case it never ended. I saw other events come and go: an economic recession lasted a few years, someone named 'Draginol' was defeated, etc. The irritating influence event never ended.
I'm wondering if this is a patching issue, since this is the only game I've had across patching, in this case from 1.0x6 to 1.0x1final.