4.81 - I'm getting an error number 3421, and it's saying it is related to cycled orders. This is on a fleet of four cargo vessels with about 10 orders total (comprising of pick up and drop off terraforming installations and a single refuel order, set to cycle). Advancing in 30 day increments, everything was fine, then I had one exceptionally slow progression (~5mins real time to progress 30 days). Attempting to advance a second increment gives the 3421 error and locks up the game, requiring me to kill the process in Task Manager.
Related to this, I can open the task groups window,and view all tabs for any group except the aforementioned cargo vessels. In their case, attempting to view the 'task group orders' tab results in the error message 'Error 6 - Overflow" which again locks up Aurora. Also, I'm pretty sure whatever this bug is has caused (or was caused by) an increase in the number of pickup/setdown orders assigned to the cargo fleet (to the point that it is necessary to scroll the window to view them all - given aurora is locked up by this stage, I can't see to what degree it's been duplicated).