Just starting my first complete game in 5.2 and I have noticed two possible bugs: first, no matter how far the shipyards are from the sponsoring planet, it will always say that distance decay is 0% when hoovering the mause over the planet in the sponsors' screen. However, the contribution to that shipyard is in fact affected by distance, so I guess it is just a problem of the decay indicator.
I have also notice that when an economic space station is made, it does not seem to affect the actual output of the nearby planet or at least this is not reflected when hoovering over the total output in the planets' screen, where it shows what is affecting total output.
On a separate front, when hoovering over the available resources on the top right of the screen, I think it would be a good idea if it would tell you what are the actual effects of the resource you are looking at, now it is complicated to find those effects in the interface...
That is all for now, keep working on the game! it is just awesome!