KnightmareX13

So for some reason the only OPT engines that are showing up for me in the game are the dark drive, e j linear aerospike, ari-73, ari-75b, stall linear aerospike, the sage and the surge. The J60, J60D, J61, and the J81 are no where to be found. Something got messed up in game files, verifying through GOG seems to have gotten it sorted out.

Yep, just hits 412 K and stays there. Although first it will hang around 417K then toggling time warp will get it to drop to 412K but won't go any lower.

Having a similar issue, the reactor isn't overheating but when I shut it down for refueling it will hang about 14 degrees above the maximum waste transfer temperature.