diff --git a/cmake/OpenfastFortranOptions.cmake b/cmake/OpenfastFortranOptions.cmake
index b4cc263b36..61d3ce6e01 100644
--- a/cmake/OpenfastFortranOptions.cmake
+++ b/cmake/OpenfastFortranOptions.cmake
@@ -158,7 +158,11 @@ macro(set_fast_intel_fortran_posix)
   # Deal with Double/Single precision
   if (DOUBLE_PRECISION)
     add_definitions(-DOPENFAST_DOUBLE_PRECISION)
-    set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -r8 -double_size 128")
+    if("${CMAKE_Fortran_COMPILER_VERSION}" VERSION_GREATER "19")
+      set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -r8 -double-size 128")
+    else()
+      set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -r8 -double_size 128")
+    endif()
   endif (DOUBLE_PRECISION)
 
   # debug flags
@@ -204,7 +208,11 @@ macro(set_fast_intel_fortran_windows)
   # Deal with Double/Single precision
   if (DOUBLE_PRECISION)
     add_definitions(-DOPENFAST_DOUBLE_PRECISION)
-    set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} /real_size:64 /double_size:128")
+    if("${CMAKE_Fortran_COMPILER_VERSION}" VERSION_GREATER "19")
+      set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} /real-size:64 /double-size:128")
+    else()
+      set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} /real_size:64 /double_size:128")
+    endif()
   endif (DOUBLE_PRECISION)
 
   # increase the default 2MB stack size to 16 MB
diff --git a/modules/aerodyn/src/FVW_Wings.f90 b/modules/aerodyn/src/FVW_Wings.f90
index 431ab3403b..bad06fbce5 100644
--- a/modules/aerodyn/src/FVW_Wings.f90
+++ b/modules/aerodyn/src/FVW_Wings.f90
@@ -175,9 +175,13 @@ subroutine Wings_Panelling(Meshes, p, m, ErrStat, ErrMsg )
             DP1                   = P6-P8
             DP2                   = P10-P9
             DP3                   = P7-P5
+
+            ! NOTE: The denominator below has seg-faulted with Intel Fortran in Release mode, possibly due to nuances in copmiler optimizations.
+            !       This code was previously after the m%Norm calculations, but moving it up "fixes" the bug.
+            m%Tang(1:3,iSpan,iW)  = (DP1)/TwoNorm(DP1)                       ! tangential unit vector, along chord
+
             m%Norm(1:3,iSpan,iW)  = cross_product(DP1,DP2)
             m%Norm(1:3,iSpan,iW)  = m%Norm(1:3,iSpan,iW)/TwoNorm(m%Norm(1:3,iSpan,iW))
-            m%Tang(1:3,iSpan,iW)  = (DP1)/TwoNorm(DP1)                       ! tangential unit vector, along chord
             ! m%Tscoord(1:3,iSpan) = (DP3)/norm2(DP3)                      ! tangential unit vector, along span, follows ref line
             m%dl  (1:3,iSpan,iW)  = DP2
             m%Orth(1:3,iSpan,iW)  = cross_product(m%Norm(1:3,iSpan,iW),m%Tang(1:3,iSpan,iW)) ! orthogonal vector to N and T
diff --git a/reg_tests/executeOpenfastLinearRegressionCase.py b/reg_tests/executeOpenfastLinearRegressionCase.py
index 11c7671e11..d23937bbfd 100644
--- a/reg_tests/executeOpenfastLinearRegressionCase.py
+++ b/reg_tests/executeOpenfastLinearRegressionCase.py
@@ -164,6 +164,9 @@ def isclose(a, b, rel_tol=1e-09, abs_tol=0.0):
 
 ### Get a list of all the files in the baseline directory
 baselineOutFiles = os.listdir(targetOutputDirectory)
+# Drop the log file, if its listed
+if caseName + '.log' in baselineOutFiles:
+    baselineOutFiles.remove(caseName + '.log')
 
 # these should all exist in the local outputs directory
 localFiles = os.listdir(testBuildDirectory)
diff --git a/reg_tests/manualRegressionTest.py b/reg_tests/manualRegressionTest.py
index ef63ddfac9..f51b1e5a5c 100644
--- a/reg_tests/manualRegressionTest.py
+++ b/reg_tests/manualRegressionTest.py
@@ -65,14 +65,20 @@ def strFormat(string):
 else:
     with open(os.path.join("r-test", "glue-codes", "openfast", "CaseList.md")) as listfile:
         caselist = listfile.readlines()
+# allow comments with '#'
 casenames = [c.rstrip("\n\r").strip() for c in caselist if "#" not in c]
+# allow empty lines
+casenames = [c for c in casenames if len(c.strip()) > 0]
 
 results = []
 prefix, passString, failString = "executing", "PASS", "FAIL"
 longestName = max(casenames, key=len)
 for case in casenames:
     print(strFormat(prefix).format(prefix), strFormat(longestName+" ").format(case), end="", flush=True)
-    command = "\"{}\" executeOpenfastRegressionCase.py {} {} {} {} {} {} {} {} {}".format(pythonCommand, case, openfast_executable, sourceDirectory, buildDirectory, tolerance, machine, compiler, plotFlag, noExecFlag)
+    if "linear" in case.lower():
+        command = "\"{}\" executeOpenfastLinearRegressionCase.py {} {} {} {} {} {} {} {} {}".format(pythonCommand, case, openfast_executable, sourceDirectory, buildDirectory, tolerance, machine, compiler, plotFlag, noExecFlag)
+    else:
+        command = "\"{}\" executeOpenfastRegressionCase.py {} {} {} {} {} {} {} {} {}".format(pythonCommand, case, openfast_executable, sourceDirectory, buildDirectory, tolerance, machine, compiler, plotFlag, noExecFlag)
     returnCode = subprocess.call(command, stdout=outstd, shell=True)
     resultString = passString if returnCode == 0 else failString
     results.append((case, resultString))
diff --git a/reg_tests/r-test b/reg_tests/r-test
index 01f51597b8..4fdfdecfce 160000
--- a/reg_tests/r-test
+++ b/reg_tests/r-test
@@ -1 +1 @@
-Subproject commit 01f51597b8f058d6f08ec67d7b9aeb4a2ffccaad
+Subproject commit 4fdfdecfce5be5da8ee5a37c837804948e6962a7