This pack causes an exception when looking at the science archives which prevents them from properly loading. I first noticed this in my (heavily modded) career save, but isolated the cause to this mod. Starting with a clean installation of KSP and adding Kronkus (and dependencies) still causes the error.
Screenshot of the science archives
KSP.log from the aforementioned clean install
And lastly, the exception thrown when viewing science archives (directly from KSP.log linked above):
[EXC 14:51:13.887] NullReferenceException: Object reference not set to an instance of an object
KSP.UI.Screens.RDArchivesController.AddPlanetRecursively (.PSystemBody parent, .PSystemBody body, Single offset_pos, Single offset_pos_inc, Int32 hierarchy_level)
KSP.UI.Screens.RDArchivesController.AddPlanetRecursively (.PSystemBody parent, .PSystemBody body, Single offset_pos, Single offset_pos_inc, Int32 hierarchy_level)
KSP.UI.Screens.RDArchivesController.AddPlanets ()
KSP.UI.Screens.RDArchivesController.Start ()