1) Freezes / crashes. Many people have complained about the game freezing up, usually in the space stage. I myself have experienced this three times so far.
No fix has been announced yet so get into the habit of saving your game often.
2) Corrupted saves. I've not experienced this myself, thankfully but some are complaining about save game files becoming corrupted and unloadable.
No fix has been announced yet so I suggest that you make backups of your save files (found in your profile's game directory).
3) Complexity bug. Creations which reached or neared maximum complexity would not display correctly or sometimes even upload at all.
This bug has been fixed.



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