Getting an overflow error (error 6) due to the number of planetary deep space tracking installations on Earth, which occurs everytime I attempt to advance a time increment. Advancing five seconds yields the same error, but small enough that the error windows can be clicked through. Attempting to advance a longer time period, e.g. 30 days, yields so many repeats of this error that even highlighting the button and holding down enter for a full minute fails to get rid of them.
Working under the assumption that this was due to the number of sensors giving me a riduculously large tracking strength, I used SM mode to systematically reduce the number of sensors from 71 down to 66, at which point the game ceased giving the overflow. Increasing the number back to 67 returned the error messages.