diff --git a/src/obiview.c b/src/obiview.c
index 615aef0..fcad58d 100644
--- a/src/obiview.c
+++ b/src/obiview.c
@@ -444,7 +444,7 @@ size_t get_platform_view_file_size()
 
 int enlarge_view_file(Obiview_p view, size_t new_size)
 {
-	int obiview_file_descriptor;
+	int    obiview_file_descriptor;
 	double multiple;
 	size_t rounded_new_size;
 
@@ -655,14 +655,31 @@ int update_column_refs_and_dict(Obiview_p view)
 
 int update_lines(Obiview_p view, index_t line_count)
 {
-	int i;
+	int 			i;
+
+	// Check that the view is not read-only
+	if (view->read_only)
+	{
+		obi_set_errno(OBIVIEW_ERROR);
+		obidebug(1, "\nError trying to update the line count of all columns in a read-only view");
+		return -1;
+	}
 
 	for (i=0; i<((view->infos)->column_count); i++)
 	{
 		while (line_count > (((view->columns)[i])->header)->line_count)
-		{
+		{	// The column needs to be enlarged
+			// Clone it first if needed
+			if (!(((view->columns)[i])->writable))
+			{
+				if (clone_column_in_view(view, (((view->infos)->column_references)[i]).alias) < 0)
+				{
+					obidebug(1, "\nError cloning a column in a view when updating its line count");
+					return -1;
+				}
+			}
 			// Enlarge the column
-			if (obi_enlarge_column((view->columns)[i]) < 0)
+			if (obi_enlarge_column(((view->columns)[i])) < 0)
 		    	return -1;
 			(((view->columns)[i])->header)->lines_used = line_count;
 		}
@@ -758,6 +775,15 @@ int prepare_to_set_value_in_column(Obiview_p view, OBIDMS_column_p* column_pp, i
 		return -1;
 	}
 
+/*	// If there is a new line selection being created, columns can't be modified	// TODO investigate this
+	if (view->new_line_selection != NULL)
+	{
+		obi_set_errno(OBIVIEW_ERROR);
+		obidebug(1, "\nError trying to set a value in a column in a view with a new line selection being created");
+		return -1;
+	}
+*/
+
 	// If there is a line selection associated with the view or if the column
 	// is read-only, all columns or this column respectively must be cloned
 	if ((view->line_selection != NULL) || (!((*column_pp)->writable)))
@@ -833,7 +859,10 @@ char* view_has_nuc_sequence_column(Obiview_p view)
 	if (obi_view_get_column(view, NUC_SEQUENCE_COLUMN) != NULL)
 		return predicate;
 	else
+	{
+		obidebug(1, "\nError checking the predicate: %s", predicate);
 		return NULL;
+	}
 }
 
 
@@ -854,7 +883,10 @@ char* view_has_quality_column(Obiview_p view)
 	if (obi_view_get_column(view, QUALITY_COLUMN) != NULL)
 		return predicate;
 	else
+	{
+		obidebug(1, "\nError checking the predicate: %s", predicate);
 		return NULL;
+	}
 }
 
 
@@ -875,10 +907,12 @@ char* view_has_id_column(Obiview_p view)
 	if (obi_view_get_column(view, ID_COLUMN) != NULL)
 		return predicate;
 	else
+	{
+		obidebug(1, "\nError checking the predicate: %s", predicate);
 		return NULL;
+	}
 }
 
-
 char* view_has_definition_column(Obiview_p view)
 {
 	char* predicate;
@@ -896,7 +930,10 @@ char* view_has_definition_column(Obiview_p view)
 	if (obi_view_get_column(view, DEFINITION_COLUMN) != NULL)
 		return predicate;
 	else
+	{
+		obidebug(1, "\nError checking the predicate: %s", predicate);
 		return NULL;
+	}
 }
 
 
@@ -923,7 +960,10 @@ char* view_check_quality_matches_seq_column(Obiview_p view)	// TODO Print error
 
 	qual_column = obi_view_get_column(view, QUALITY_COLUMN);
 	if (qual_column == NULL)
+	{
+		obidebug(1, "\nError checking the predicate: %s", predicate);
 		return NULL;
+	}
 
 	seq_column = obi_view_get_column(view, ((qual_column->header)->associated_column).column_name);
 	//seq_column = obi_open_column(view->dms, ((qual_column->header)->associated_column).column_name, ((qual_column->header)->associated_column).version);
@@ -931,12 +971,18 @@ char* view_check_quality_matches_seq_column(Obiview_p view)	// TODO Print error
 	// TODO if outside of view, make function that opens a column from a column reference structure?
 
 	if (seq_column == NULL)
+	{
+		obidebug(1, "\nError checking the predicate: %s", predicate);
 		return NULL;
+	}
 
 	nb_elements_per_line = (qual_column->header)->nb_elements_per_line;
 	// Check that the quality and the sequence columns have the same number of elements per line
 	if (nb_elements_per_line != (seq_column->header)->nb_elements_per_line)
+	{
+		obidebug(1, "\nError checking the predicate: %s", predicate);
 		return NULL;
+	}
 
 	for (i=0; i < (view->infos)->line_count; i++)
 	{
@@ -948,11 +994,17 @@ char* view_check_quality_matches_seq_column(Obiview_p view)	// TODO Print error
 			{
 				// Test that the lengths of the quality and the sequence are equal
 				if (qual_len != (int)strlen(seq))
+				{
+					obidebug(1, "\nError checking the predicate: %s", predicate);
 					return NULL;
+				}
 			}
 			// Test if one value is NA and not the other
 			else if (((qual == OBIQual_int_NA) && (seq != OBISeq_NA)) || ((qual != OBIQual_int_NA) && (seq == OBISeq_NA)))
+			{
+				obidebug(1, "\nError checking the predicate: %s", predicate);
 				return NULL;
+			}
 		}
 	}
 
@@ -1947,7 +1999,10 @@ int obi_save_and_close_view(Obiview_p view)
 		{
 			predicates = view_check_all_predicates(view);
 			if (predicates == NULL)
+			{
+				obidebug(1, "\nView predicates not respected");
 				return -1;	// TODO reverse view (delete files)
+			}
 			else
 			{
 				write_comments_to_view_file(view, predicates);