diff --git a/modules/aerodyn/src/AeroAcoustics.f90 b/modules/aerodyn/src/AeroAcoustics.f90
index c22f4c3d2..708ab8fe4 100644
--- a/modules/aerodyn/src/AeroAcoustics.f90
+++ b/modules/aerodyn/src/AeroAcoustics.f90
@@ -165,6 +165,7 @@ subroutine SetParameters( InitInp, InputFileData, p, AFInfo, ErrStat, ErrMsg )
     character(*), parameter :: RoutineName = 'SetParameters'
     REAL(ReKi)              :: val1,val10,f2,f4, dist1, dist10
     REAL(ReKi)              :: BladeSpanUsedForNoise
+    REAL(ReKi)              :: LastElemPct
     
     ! Initialize variables for this routine
     ErrStat  = ErrID_None
@@ -271,7 +272,14 @@ subroutine SetParameters( InitInp, InputFileData, p, AFInfo, ErrStat, ErrMsg )
     p%BlSpn   = InitInp%BlSpn
     p%BlChord = InitInp%BlChord
 
-    IF (InputFileData%AA_Bl_Prcntge .lt. (100.*(p%BlSpn(p%NumBlNds,1) - p%BlSpn(p%NumBlNds-1,1))/p%BlSpn(p%NumBlNds,1))) THEN
+    ! Calculate last element size as percentage of blade span
+    IF (p%NumBlNds > 1) THEN
+        LastElemPct = 100.0 * (p%BlSpn(p%NumBlNds,1) - p%BlSpn(p%NumBlNds-1,1)) / p%BlSpn(p%NumBlNds,1)
+    ELSE
+        LastElemPct = 100.0  ! Single node means element spans entire blade
+    ENDIF
+
+    IF (InputFileData%AA_Bl_Prcntge .lt. LastElemPct) THEN
         CALL SetErrStat(ErrID_Warn, 'BldPrcnt is smaller than the last blade element size. '// &
             'OpenFAST will move on assuming the last blade element, which is the minimum blade span used for noise calculations. '// &
             'Either increase BldPrcnt in your aeroacoustic input file '// &
diff --git a/modules/aerodyn/src/FVW_IO.f90 b/modules/aerodyn/src/FVW_IO.f90
index a7c252bf0..a037c85dc 100644
--- a/modules/aerodyn/src/FVW_IO.f90
+++ b/modules/aerodyn/src/FVW_IO.f90
@@ -458,7 +458,13 @@ subroutine ResolveGridAxis(AStart, AEnd, n, ListFile, Pts, ErrStat, ErrMsg)
          return
       endif
       do j = 1, n
-         read(UnList, *) Pts(j)
+         read(UnList, *, iostat=IOS) Pts(j)
+         if (IOS /= 0) then
+            call SetErrStat(ErrID_Fatal, 'ResolveGridAxis: error reading grid point #'//trim(Num2LStr(j))//' from grid point list file "'//trim(FullFile)//'" (iostat='//trim(Num2LStr(IOS))//').', &
+                             ErrStat, ErrMsg, 'ResolveGridAxis')
+            close(UnList)
+            return
+         end if
       enddo
       close(UnList)
 
diff --git a/modules/inflowwind/src/IfW_FlowField.f90 b/modules/inflowwind/src/IfW_FlowField.f90
index a8212790e..43f21947e 100644
--- a/modules/inflowwind/src/IfW_FlowField.f90
+++ b/modules/inflowwind/src/IfW_FlowField.f90
@@ -78,11 +78,19 @@ subroutine IfW_FlowField_GetVelAcc(FF, IStart, Time, PositionXYZ, VelocityUVW, A
 
    ! Determine if acceleration should be calculated and returned
    OutputAccel = allocated(AccelUVW)
-   ! Cubic velocity interpolation also requires a valid acceleration field, since its
-   ! formula uses the derivative data even when acceleration output is not requested.
+   ! Cubic velocity interpolation also requires a valid acceleration field,
+   ! since its formula uses the derivative data even when acceleration output is not requested.
    if ((OutputAccel .or. FF%VelInterpCubic) .and. .not. FF%AccFieldValid) then
-      call SetErrStat(ErrID_Fatal, "Accel output requested, but accel field is not valid", &
-                      ErrStat, ErrMsg, RoutineName)
+      if (OutputAccel .and. FF%VelInterpCubic) then
+         call SetErrStat(ErrID_Fatal, "Acceleration output and cubic velocity interpolation both require a valid acceleration field, but the acceleration field is not valid", &
+                         ErrStat, ErrMsg, RoutineName)
+      else if (OutputAccel) then
+         call SetErrStat(ErrID_Fatal, "Acceleration output requested, but the acceleration field is not valid", &
+                         ErrStat, ErrMsg, RoutineName)
+      else  ! FF%VelInterpCubic
+         call SetErrStat(ErrID_Fatal, "Cubic velocity interpolation requires a valid acceleration field, but the acceleration field is not valid", &
+                         ErrStat, ErrMsg, RoutineName)
+      end if
       return
    end if