diff --git a/CMakeLists.txt b/CMakeLists.txt
index 6dfc07b8..9ade093b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,5 +1,6 @@
 cmake_minimum_required(VERSION 3.20.2)
-project(Kaiju Fortran)
+project(Kaiju Fortran C)
+#K: Adding C to project to deal w/ issues w/ most recent HDF (10/13/25)
 
 # add and search for pfunit (fingers crossed)
 list(APPEND CMAKE_PREFIX_PATH "./external")
diff --git a/cmake/compilers.cmake b/cmake/compilers.cmake
index a4089d60..719249b0 100644
--- a/cmake/compilers.cmake
+++ b/cmake/compilers.cmake
@@ -83,7 +83,12 @@ if(CMAKE_Fortran_COMPILER_ID MATCHES Intel)
 	#Base
 	string(APPEND CMAKE_Fortran_FLAGS " -fPIC -fpconstant")
 	#Production
-    set(PROD "-align array64byte -align rec32byte -no-prec-div -fast-transcendentals")
+    set(PROD "-align array64byte -align rec32byte -no-prec-div")
+    if (CMAKE_Fortran_COMPILER_VERSION VERSION_LESS 23.1)
+    	#Fast transcendentals removed in ifx
+    	string(APPEND PROD " -fast-transcendentals")
+    endif()
+    	
     #Production with Debug Info
     set(PRODWITHDEBUGINFO "-traceback -debug all -align array64byte -align rec32byte -no-prec-div -fast-transcendentals")
 	#Debug
@@ -126,7 +131,7 @@ if(CMAKE_Fortran_COMPILER_ID MATCHES Intel)
 	endif()
 
 	#Check Intel Fortran version
-	if(NOT ALLOW_INVALID_COMPILERS AND CMAKE_Fortran_COMPILER_VERSION VERSION_GREATER "2021.9")
+	if(NOT ALLOW_INVALID_COMPILERS AND CMAKE_Fortran_COMPILER_VERSION VERSION_GREATER "2021.9" AND CMAKE_Fortran_COMPILER_VERSION VERSION_LESS "2025.1")
 		message(FATAL_ERROR "Intel Fortran compilers newer than 2023 (version 2021.8) are not supported. Set the ALLOW_INVALID_COMPILERS variable to ON to force compilation at your own risk.")
 	endif()
 
diff --git a/src/voltron/mpi/modelInterfaces/gamCouple_mpi_V2G.F90 b/src/voltron/mpi/modelInterfaces/gamCouple_mpi_V2G.F90
index 910b23b6..e3565753 100644
--- a/src/voltron/mpi/modelInterfaces/gamCouple_mpi_V2G.F90
+++ b/src/voltron/mpi/modelInterfaces/gamCouple_mpi_V2G.F90
@@ -559,13 +559,13 @@ module gamCouple_mpi_V2G
 
     subroutine sendGameraCplDataMpi(gCplApp, CouplingTargetT)
         class(gamCouplerMpi_volt_T), intent(inout) :: gCplApp
-        real(rp), intent(in) :: CouplingTargetT
+        real(rp), intent(inout) :: CouplingTargetT
 
         call sendShallowCplDataMpi(gCplApp)
         if(gCplApp%doDeep) call sendDeepCplDataMpi(gCplApp)
         call sendCplTimeMpi(gCplApp, CouplingTargetT)
 
-    end subroutine
+    end subroutine sendGameraCplDataMpi
 
     subroutine sendShallowCplDataMpi(gCplApp)
         class(gamCouplerMpi_volt_T), intent(inout) :: gCplApp
@@ -628,14 +628,14 @@ module gamCouple_mpi_V2G
 
     subroutine sendCplTimeMpi(gCplApp, CouplingTargetT)
         class(gamCouplerMpi_volt_T), intent(inout) :: gCplApp
-        real(rp), intent(in) :: CouplingTargetT
+        real(rp), intent(inout) :: CouplingTargetT
 
         integer :: ierr
 
         ! Send Target Time for next coupling
         call mpi_bcast(CouplingTargetT,1,MPI_MYFLOAT, gCplApp%myRank, gCplApp%couplingComm, ierr)
 
-    end subroutine
+    end subroutine sendCplTimeMpi
 
 end module
 
diff --git a/src/voltron/mpi/volthelpers_mpi.F90 b/src/voltron/mpi/volthelpers_mpi.F90
index 7442fee4..66bf1474 100644
--- a/src/voltron/mpi/volthelpers_mpi.F90
+++ b/src/voltron/mpi/volthelpers_mpi.F90
@@ -107,7 +107,7 @@ module volthelpers_mpi
     ! chimp data update functions
 
     subroutine sendChimpStateData(ebState, vHelpComm)
-        type(ebState_T), intent(in) :: ebState
+        type(ebState_T), intent(inout) :: ebState
         type(MPI_Comm), intent(in) :: vHelpComm
 
         integer :: ierr, length
@@ -195,7 +195,7 @@ module volthelpers_mpi
             call mpi_Abort(MPI_COMM_WORLD, 1, ierr)
         end if
 
-    end subroutine
+    end subroutine sendChimpStateData
 
     subroutine recvChimpStateData(ebState, vHelpComm)
         type(ebState_T), intent(inout) :: ebState
@@ -272,7 +272,7 @@ module volthelpers_mpi
     end subroutine
 
     subroutine sendChimpUpdate(vApp)
-        type(voltAppMpi_T), intent(in) :: vApp
+        type(voltAppMpi_T), intent(inout) :: vApp
 
         integer :: ierr, length
         character( len = MPI_MAX_ERROR_STRING) :: message
@@ -317,7 +317,7 @@ module volthelpers_mpi
             call mpi_Abort(MPI_COMM_WORLD, 1, ierr)
         end if
 
-    end subroutine
+    end subroutine sendChimpUpdate
 
     subroutine recvChimpUpdate(vApp)
         type(voltAppMpi_T), intent(inout) :: vApp
@@ -374,14 +374,15 @@ module volthelpers_mpi
         type(voltAppMpi_T), intent(in) :: vApp
         integer, intent(in) :: rType
 
-        integer :: ierr
+        integer :: ierr,wtf
         type(MPI_Request) :: helpReq
 
+        wtf = rType
         ! async to match waiting helper nodes
-        call mpi_Ibcast(rType, 1, MPI_INTEGER, 0, vApp%vHelpComm, helpReq, ierr)
+        call mpi_Ibcast(wtf, 1, MPI_INTEGER, 0, vApp%vHelpComm, helpReq, ierr)
         call mpi_wait(helpReq, MPI_STATUS_IGNORE, ierr)
 
-    end subroutine
+    end subroutine vhRequestType
 
     subroutine vhReqStep(vApp)
         type(voltAppMpi_T), intent(inout) :: vApp