Ran into the same issue as GamersCircle.
Clicked on the observatory to check progress. Got input locks, the game then loads and saves all celestial bodies as found and 100% tracked and known.
Upon loading the persistent save, all bodies are unlocked/known.
Repro steps :
Launch 1.8.1 Ksp
Reach 100% research on one bodies orbit.
Click Observatory.
*The local time of bug was after 2:04:00*
KSP playerLog : (Appdata playerlog) https://www.dropbox.com/s/pai70mkcf7o9nw7/PlayerlogModded.log?dl=0
KSP log : (KSP log in folder the game .exe is in) https://www.dropbox.com/s/o7busx1mmelhohf/KSP.log?dl=0
Screenshots : https://imgur.com/0H4En3M The input locks.
#2 : https://imgur.com/llVS9TL Console.
Mod List : https://imgur.com/o6FbtE6
Let me know if theres more you need.
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I have removed all mods except the necessary ones for the planetpack, except for TarsierSpaceTech, Kerbal engineer and Tweak Scale. All module manager configs deleted, Settings deleted, Brand new save.
Logs : Player Log https://www.dropbox.com/s/r9n9lb53aeijybe/Player2.log?dl=0
KSP .exe Log : https://www.dropbox.com/s/39870uvo995rpi1/KSP2.log?dl=0
Screenshot of mods : https://imgur.com/UKWQt1r
Takes about 10 min to reproduce this. Start new game, Cheat in money and science. Level up tracking station and RND to tier 2, unlock Space telescope, Build craft with basic control a return pod, and the telescope with a probecore. Set orbit around home planet. Take photo of moon, beam science. Transfer burn into SOI of moon, decouple crafts, Capture burn both crafts. Take another photo of the moon in its own SOI. Return home with crew, Click observatory.
Once you reach 100% research on any body, all other bodies become known/unlocked(all orbits known/planet names/ ect.)
Upon clicking observatory, the KSC hud dissapears, and you cant do anything but open Console, and move the camera around.