I've been getting this warning for a while now. I haven't noticed any real issues from it, though.

Medical Tab :: Tag Tongue is not associated with any pawnCapacity. This may be intentional. For modders; if the tag defName contains the capacity defName the two will be linked.
UnityEngine.StackTraceUtility:ExtractStackTrace ()
Verse.Log:Warning (string)
Fluffy.CapacityUtility:.cctor ()
System.Runtime.CompilerServices.RuntimeHelpers:RunClassConstructor (System.RuntimeTypeHandle)
Verse.StaticConstructorOnStartupUtility:CallAll ()
Verse.PlayDataLoader/<>c:<DoPlayLoad>b__4_3 ()
Verse.LongEventHandler:ExecuteToExecuteWhenFinished ()
Verse.LongEventHandler:UpdateCurrentAsynchronousEvent ()
Verse.LongEventHandler:LongEventsUpdate (bool&)
(wrapper dynamic-method) Verse.Root:Verse.Root.Update_Patch1 (Verse.Root)
Verse.Root_Entry:Update ()

for some reason the displayed medical tab is no longer accessible to me

Hello Fluffy, I almost have the same message as Cyber (message above) but I get this message when I launch RIMWORLD 1.3.3389 (64 bit)

Medical Tab :: Tag Tongue is not associated with any pawnCapacity. This may be intentional. For modders; if the tag defName contains the capacity defName the two will be linked.
UnityEngine.StackTraceUtility:ExtractStackTrace ()
Verse.Log:Warning (string)
Fluffy.CapacityUtility:.cctor ()
System.Runtime.CompilerServices.RuntimeHelpers:RunClassConstructor (System.RuntimeTypeHandle)
(wrapper dynamic-method) Verse.StaticConstructorOnStartupUtility:Verse.StaticConstructorOnStartupUtility.CallAll_Patch1 ()
Verse.PlayDataLoader/<>c:<DoPlayLoad>b__4_3 ()
(wrapper dynamic-method) Verse.LongEventHandler:Verse.LongEventHandler.ExecuteToExecuteWhenFinished_Patch0 ()
Verse.LongEventHandler:UpdateCurrentAsynchronousEvent ()
Verse.LongEventHandler:LongEventsUpdate (bool&)
(wrapper dynamic-method) Verse.Root:Verse.Root.Update_Patch1 (Verse.Root)
(wrapper dynamic-method) Verse.Root_Entry:Verse.Root_Entry.Update_Patch0 (Verse.Root_Entry)

Did the medical tab used to have a icon on it? it doesn't show anymore.

Hello,

I keep getting this too on ver 1.3.3389 rev 40. Only had Harmony, Core and Medical Tab running when it started.

Medical Tab :: Tag Tongue is not associated with any pawnCapacity. This may be intentional. For modders; if the tag defName contains the capacity defName the two will be linked.
UnityEngine.StackTraceUtility:ExtractStackTrace ()
Verse.Log:Warning (string)
Fluffy.CapacityUtility:.cctor ()
System.Runtime.CompilerServices.RuntimeHelpers:RunClassConstructor (System.RuntimeTypeHandle)
(wrapper dynamic-method) Verse.StaticConstructorOnStartupUtility:Verse.StaticConstructorOnStartupUtility.CallAll_Patch1 ()
Verse.PlayDataLoader/<>c:<DoPlayLoad>b__4_3 ()
Verse.LongEventHandler:ExecuteToExecuteWhenFinished ()
Verse.LongEventHandler:UpdateCurrentAsynchronousEvent ()
Verse.LongEventHandler:LongEventsUpdate (bool&)
(wrapper dynamic-method) Verse.Root:Verse.Root.Update_Patch1 (Verse.Root)
Verse.Root_Entry:Update ()

Just came here to comment that I'm getting the same errors as the posters above regarding "Tag Tongue is not associated with any pawnCapacity". Not sure if it's a conflict somewhere or a bug with the mod. If anyone has figured out a fix a response would be appreciated! Thank you!

Same as everyone else, "Tag Tongue is not associated with any pawnCapacity"

Exception filling window for Fluffy.MainTabWindow_Medical: System.NullReferenceException: Object reference not set to an instance of an object
at Fluffy.CapacityUtility.AffectsCapacityOnIngestion (Verse.ThingDef def, Verse.PawnCapacityDef capacity, System.Single current, System.Boolean negative) [0x0003b] in <cfba35c05604436fb917b2eb307603b0>:0
at Fluffy.CapacityUtility.AdministersDrugThatAffects (Verse.RecipeDef r, Verse.PawnCapacityDef capacity, System.Single current, System.Boolean negative) [0x00025] in <cfba35c05604436fb917b2eb307603b0>:0
at Fluffy.CapacityUtility.Affects (RimWorld.Bill_Medical bill, Verse.PawnCapacityDef capacity) [0x00024] in <cfba35c05604436fb917b2eb307603b0>:0
at Fluffy.PawnColumnWorker_Capacity.<DoPendingBillsDrawExtra>b__14_0 (RimWorld.Bill b) [0x0000c] in <cfba35c05604436fb917b2eb307603b0>:0
at System.Collections.Generic.List`1[T].FindIndex (System.Int32 startIndex, System.Int32 count, System.Predicate`1[T] match) [0x0003b] in <eae584ce26bc40229c1b1aa476bfa589>:0
at System.Collections.Generic.List`1[T].FindIndex (System.Predicate`1[T] match) [0x00000] in <eae584ce26bc40229c1b1aa476bfa589>:0
at Verse.GenCollection.Any[T] (System.Collections.Generic.List`1[T] list, System.Predicate`1[T] predicate) [0x00000] in <95de19971c5d40878d8742747904cdcd>:0
at Fluffy.PawnColumnWorker_Capacity.DoPendingBillsDrawExtra (UnityEngine.Rect rect, Verse.Pawn pawn) [0x0000b] in <cfba35c05604436fb917b2eb307603b0>:0
at Fluffy.PawnColumnWorker_Capacity.DoCell (UnityEngine.Rect rect, Verse.Pawn pawn, RimWorld.PawnTable table) [0x00052] in <cfba35c05604436fb917b2eb307603b0>:0
at (wrapper dynamic-method) RimWorld.PawnTable.RimWorld.PawnTable.PawnTableOnGUI_Patch1(RimWorld.PawnTable,UnityEngine.Vector2)
at RimWorld.MainTabWindow_PawnTable.DoWindowContents (UnityEngine.Rect rect) [0x00020] in <95de19971c5d40878d8742747904cdcd>:0
at Fluffy.MainTabWindow_Medical.DoWindowContents (UnityEngine.Rect rect) [0x00052] in <cfba35c05604436fb917b2eb307603b0>:0
at (wrapper dynamic-method) Verse.Window.Verse.Window.InnerWindowOnGUI_Patch0(Verse.Window,int)
(Filename: C:\buildslave\unity\build\Runtime/Export/Debug/Debug.bindings.h Line: 39)