diff --git a/ompi/mca/common/ompio/common_ompio_file_read.c b/ompi/mca/common/ompio/common_ompio_file_read.c
index 6d6d112eb3..3203e2a697 100644
--- a/ompi/mca/common/ompio/common_ompio_file_read.c
+++ b/ompi/mca/common/ompio/common_ompio_file_read.c
@@ -77,6 +77,12 @@ int mca_common_ompio_file_read (ompio_file_t *fh,
     int i = 0; /* index into the decoded iovec of the buffer */
     int j = 0; /* index into the file vie iovec */
 
+    if (fh->f_amode & MPI_MODE_WRONLY){
+//      opal_output(10, "Improper use of FILE Mode, Using WRONLY for Read!\n");
+        ret = MPI_ERR_ACCESS;
+      return ret;
+    }
+
     if ( 0 == count ) {
         if ( MPI_STATUS_IGNORE != status ) {
             status->_ucount = 0;
@@ -84,11 +90,6 @@ int mca_common_ompio_file_read (ompio_file_t *fh,
         return ret;
     }
 
-    if (fh->f_amode & MPI_MODE_WRONLY){
-      printf("Improper use of FILE Mode, Using WRONLY for Read!\n");
-      ret = OMPI_ERROR;
-      return ret;
-    }
 
 #if OPAL_CUDA_SUPPORT
     int is_gpu, is_managed;
@@ -226,6 +227,12 @@ int mca_common_ompio_file_iread (ompio_file_t *fh,
     mca_ompio_request_t *ompio_req=NULL;
     size_t spc=0;
 
+    if (fh->f_amode & MPI_MODE_WRONLY){
+//      opal_output(10, "Improper use of FILE Mode, Using WRONLY for Read!\n");
+        ret = MPI_ERR_ACCESS;
+      return ret;
+    }
+
     mca_common_ompio_request_alloc ( &ompio_req, MCA_OMPIO_REQUEST_READ);
 
     if ( 0 == count ) {
diff --git a/ompi/mca/common/ompio/common_ompio_file_view.c b/ompi/mca/common/ompio/common_ompio_file_view.c
index 71ba14ba02..bf8a25345b 100644
--- a/ompi/mca/common/ompio/common_ompio_file_view.c
+++ b/ompi/mca/common/ompio/common_ompio_file_view.c
@@ -141,6 +141,10 @@ int mca_common_ompio_set_view (ompio_file_t *fh,
     // in orig_file type, No need to set args on this one.
     ompi_datatype_duplicate (newfiletype, &fh->f_filetype);
 
+    if ( (fh->f_view_size % fh->f_etype_size) ) {
+        // File view is not a multiple of the etype.
+        return MPI_ERR_ARG;
+    }
 
     if( SIMPLE_PLUS == OMPIO_MCA_GET(fh, grouping_option) ) {
         fh->f_cc_size = get_contiguous_chunk_size (fh, 1);
diff --git a/ompi/mca/common/ompio/common_ompio_file_write.c b/ompi/mca/common/ompio/common_ompio_file_write.c
index fb62edf2d9..e53a1d080b 100644
--- a/ompi/mca/common/ompio/common_ompio_file_write.c
+++ b/ompi/mca/common/ompio/common_ompio_file_write.c
@@ -58,6 +58,13 @@ int mca_common_ompio_file_write (ompio_file_t *fh,
     int i = 0; /* index into the decoded iovec of the buffer */
     int j = 0; /* index into the file view iovec */
 
+    if (fh->f_amode & MPI_MODE_RDONLY){
+//      opal_output(10, "Improper use of FILE Mode, Using RDONLY for write!\n");
+        ret = MPI_ERR_READ_ONLY;
+      return ret;
+    }
+
+    
     if ( 0 == count ) {
         if ( MPI_STATUS_IGNORE != status ) {
             status->_ucount = 0;
@@ -194,6 +201,12 @@ int mca_common_ompio_file_iwrite (ompio_file_t *fh,
     mca_ompio_request_t *ompio_req=NULL;
     size_t spc=0;
 
+    if (fh->f_amode & MPI_MODE_RDONLY){
+//      opal_output(10, "Improper use of FILE Mode, Using RDONLY for write!\n");
+        ret = MPI_ERR_READ_ONLY;
+      return ret;
+    }
+    
     mca_common_ompio_request_alloc ( &ompio_req, MCA_OMPIO_REQUEST_WRITE);
 
     if ( 0 == count ) {
diff --git a/ompi/mca/io/ompio/io_ompio_file_open.c b/ompi/mca/io/ompio/io_ompio_file_open.c
index 37f7b308b7..37bc8fea57 100644
--- a/ompi/mca/io/ompio/io_ompio_file_open.c
+++ b/ompi/mca/io/ompio/io_ompio_file_open.c
@@ -9,7 +9,7 @@
  *                         University of Stuttgart.  All rights reserved.
  * Copyright (c) 2004-2005 The Regents of the University of California.
  *                         All rights reserved.
- * Copyright (c) 2008-2016 University of Houston. All rights reserved.
+ * Copyright (c) 2008-2018 University of Houston. All rights reserved.
  * Copyright (c) 2015-2018 Research Organization for Information Science
  *                         and Technology (RIST). All rights reserved.
  * Copyright (c) 2016      Cisco Systems, Inc.  All rights reserved.
@@ -372,6 +372,13 @@ int mca_io_ompio_file_sync (ompi_file_t *fh)
         OPAL_THREAD_UNLOCK(&fh->f_lock);
         return MPI_ERR_ACCESS;
     }        
+    // Make sure all processes reach this point before syncing the file.
+    ret = data->ompio_fh.f_comm->c_coll->coll_barrier (data->ompio_fh.f_comm,
+                                                       data->ompio_fh.f_comm->c_coll->coll_barrier_module);
+    if ( MPI_SUCCESS != ret ) {
+        OPAL_THREAD_UNLOCK(&fh->f_lock);
+        return ret;
+    }
     ret = data->ompio_fh.f_fs->fs_file_sync (&data->ompio_fh);
     OPAL_THREAD_UNLOCK(&fh->f_lock);
 
@@ -400,8 +407,9 @@ int mca_io_ompio_file_seek (ompi_file_t *fh,
         }
         break;
     case MPI_SEEK_CUR:
-        offset += data->ompio_fh.f_position_in_file_view;
-        offset += data->ompio_fh.f_disp;
+        ret = mca_common_ompio_file_get_position (&data->ompio_fh,
+                                                  &temp_offset);
+        offset += temp_offset;
         if (offset < 0) {
             OPAL_THREAD_UNLOCK(&fh->f_lock);
             return OMPI_ERROR;
diff --git a/ompi/mca/io/ompio/io_ompio_file_set_view.c b/ompi/mca/io/ompio/io_ompio_file_set_view.c
index ba18db8fe1..72671c3410 100644
--- a/ompi/mca/io/ompio/io_ompio_file_set_view.c
+++ b/ompi/mca/io/ompio/io_ompio_file_set_view.c
@@ -9,7 +9,7 @@
  *                         University of Stuttgart.  All rights reserved.
  * Copyright (c) 2004-2005 The Regents of the University of California.
  *                         All rights reserved.
- * Copyright (c) 2008-2016 University of Houston. All rights reserved.
+ * Copyright (c) 2008-2018 University of Houston. All rights reserved.
  * Copyright (c) 2015-2018 Research Organization for Information Science
  *                         and Technology (RIST). All rights reserved.
  * Copyright (c) 2016-2017 IBM Corporation. All rights reserved.
@@ -66,13 +66,17 @@ int mca_io_ompio_file_set_view (ompi_file_t *fp,
     mca_common_ompio_data_t *data;
     ompio_file_t *fh;
 
+    if ( (strcmp(datarep, "native") && strcmp(datarep, "NATIVE"))) {
+        return MPI_ERR_UNSUPPORTED_DATAREP;
+    }
+
     data = (mca_common_ompio_data_t *) fp->f_io_selected_data;
 
     /* we need to call the internal file set view twice: once for the individual
        file pointer, once for the shared file pointer (if it is existent)
     */
     fh = &data->ompio_fh;
-
+  
     OPAL_THREAD_LOCK(&fp->f_lock);
     ret = mca_common_ompio_set_view(fh, disp, etype, filetype, datarep, info);
     OPAL_THREAD_UNLOCK(&fp->f_lock);
diff --git a/ompi/mpi/c/file_set_view.c b/ompi/mpi/c/file_set_view.c
index a49a80f29a..c62df489aa 100644
--- a/ompi/mpi/c/file_set_view.c
+++ b/ompi/mpi/c/file_set_view.c
@@ -64,6 +64,10 @@ int MPI_File_set_view(MPI_File fh, MPI_Offset disp, MPI_Datatype etype,
                OMPI_CHECK_DATATYPE_FOR_VIEW(rc, filetype, 0);
            }
         }
+        if ( NULL == datarep) {
+            rc = MPI_ERR_UNSUPPORTED_DATAREP;
+            fh = MPI_FILE_NULL;            
+        }
         OMPI_ERRHANDLER_CHECK(rc, fh, rc, FUNC_NAME);
     }