diff -up GabeditSrc250/src/Display/PovrayGL.c.strlen GabeditSrc250/src/Display/PovrayGL.c
--- GabeditSrc250/src/Display/PovrayGL.c.strlen	2017-07-12 00:13:34.302930668 +0200
+++ GabeditSrc250/src/Display/PovrayGL.c	2017-07-12 00:14:52.286542837 +0200
@@ -1671,7 +1671,8 @@ static void exportPOVRay(GtkWidget* Win,
 		gint i;
 		if(tmp) l = strlen(tmp);
 		for(i=l-1;i>=1;i--) if(tmp[i]=='.') tmp[i]='\0';
-		if(dirName[strlen(dirName)-1] != G_DIR_SEPARATOR)
+		if(!dirName) dirName = g_strdup(g_get_current_dir());
+		if(dirName && dirName[strlen(dirName)-1] != G_DIR_SEPARATOR)
 		{
 			fileNamePOV = g_strdup_printf("%s%s%s.pov",dirName, G_DIR_SEPARATOR_S,tmp);
 			fileNameIMG = g_strdup_printf("%s%s%s.png",dirName, G_DIR_SEPARATOR_S,tmp);
diff -up GabeditSrc250/src/Geometry/Povray.c.strlen GabeditSrc250/src/Geometry/Povray.c
--- GabeditSrc250/src/Geometry/Povray.c.strlen	2017-07-12 00:13:34.302930668 +0200
+++ GabeditSrc250/src/Geometry/Povray.c	2017-07-12 00:15:41.326298949 +0200
@@ -1267,7 +1267,8 @@ static void exportPOVRay(GtkWidget* Win,
 		gint i;
 		if(tmp) l = strlen(tmp);
 		for(i=l-1;i>=1;i--) if(tmp[i]=='.') tmp[i]='\0';
-		if(dirName[strlen(dirName)-1] != G_DIR_SEPARATOR)
+		if(!dirName) dirName = g_strdup(g_get_current_dir());
+		if(dirName && dirName[strlen(dirName)-1] != G_DIR_SEPARATOR)
 		{
 			fileNamePOV = g_strdup_printf("%s%s%s.pov",dirName, G_DIR_SEPARATOR_S,tmp);
 			fileNameIMG = g_strdup_printf("%s%s%s.png",dirName, G_DIR_SEPARATOR_S,tmp);
diff -up GabeditSrc250/src/SemiEmpirical/SemiEmpiricalDlg.c.strlen GabeditSrc250/src/SemiEmpirical/SemiEmpiricalDlg.c
--- GabeditSrc250/src/SemiEmpirical/SemiEmpiricalDlg.c.strlen	2017-07-10 13:52:53.000000000 +0200
+++ GabeditSrc250/src/SemiEmpirical/SemiEmpiricalDlg.c	2017-07-12 00:13:34.303930663 +0200
@@ -1328,6 +1328,7 @@ static void runSemiEmpirical(GtkWidget*
 	{
 		gchar* dirName = gtk_file_chooser_get_current_folder (GTK_FILE_CHOOSER(buttonDirSelector));
 		gchar* tmp = g_strdup(gtk_entry_get_text(GTK_ENTRY(entryFileName)));
+		if(!dirName) dirName = g_strdup(g_get_home_dir());
 		if(dirName[strlen(dirName)-1] != G_DIR_SEPARATOR)
 			fileName = g_strdup_printf("%s%s%s",dirName, G_DIR_SEPARATOR_S,tmp);
 		else
@@ -4493,7 +4494,8 @@ static void semiEmpiricalMDConfo(GtkWidg
 	{
 		dirName = gtk_file_chooser_get_current_folder (GTK_FILE_CHOOSER(buttonDirSelector));
 		gchar* tmp = g_strdup(gtk_entry_get_text(GTK_ENTRY(entryFileNameGeom)));
-		if(dirName[strlen(dirName)-1] != G_DIR_SEPARATOR)
+		if(!dirName) dirName = g_strdup(g_get_current_dir());
+		if(dirName && dirName[strlen(dirName)-1] != G_DIR_SEPARATOR)
 			fileNameGeom = g_strdup_printf("%s%s%s",dirName, G_DIR_SEPARATOR_S,tmp);
 		else
 			fileNameGeom = g_strdup_printf("%s%s",dirName, tmp);
@@ -4511,7 +4513,8 @@ static void semiEmpiricalMDConfo(GtkWidg
 	{
 		if(!dirName) dirName = gtk_file_chooser_get_current_folder (GTK_FILE_CHOOSER(buttonDirSelector));
 		gchar* tmp = g_strdup(gtk_entry_get_text(GTK_ENTRY(entryFileNameTraj)));
-		if(dirName[strlen(dirName)-1] != G_DIR_SEPARATOR)
+		if(!dirName) dirName = g_strdup(g_get_current_dir());
+		if(dirName && dirName[strlen(dirName)-1] != G_DIR_SEPARATOR)
 			fileNameTraj = g_strdup_printf("%s%s%s",dirName, G_DIR_SEPARATOR_S,tmp);
 		else
 			fileNameTraj = g_strdup_printf("%s%s",dirName, tmp);
@@ -4523,7 +4526,8 @@ static void semiEmpiricalMDConfo(GtkWidg
 	{
 		if(!dirName) dirName = gtk_file_chooser_get_current_folder (GTK_FILE_CHOOSER(buttonDirSelector));
 		gchar* tmp = g_strdup(gtk_entry_get_text(GTK_ENTRY(entryFileNameProp)));
-		if(dirName[strlen(dirName)-1] != G_DIR_SEPARATOR)
+		if(!dirName) dirName = g_strdup(g_get_current_dir());
+		if(dirName && dirName[strlen(dirName)-1] != G_DIR_SEPARATOR)
 			fileNameProp = g_strdup_printf("%s%s%s",dirName, G_DIR_SEPARATOR_S,tmp);
 		else
 			fileNameProp = g_strdup_printf("%s%s",dirName, tmp);
@@ -4825,10 +4829,11 @@ static void semiEmpiricalMD(GtkWidget* W
 	if(stepSize>5) stepSize = 5.0;
 
 	dirName = gtk_file_chooser_get_current_folder (GTK_FILE_CHOOSER(buttonDirSelector));
+	if(!dirName) dirName = g_strdup(g_get_current_dir());
 	if(GTK_TOGGLE_BUTTON (buttonSaveTraj)->active)
 	{
 		gchar* tmp = g_strdup(gtk_entry_get_text(GTK_ENTRY(entryFileNameTraj)));
-		if(dirName[strlen(dirName)-1] != G_DIR_SEPARATOR)
+		if(dirName && dirName[strlen(dirName)-1] != G_DIR_SEPARATOR)
 			fileNameTraj = g_strdup_printf("%s%s%s",dirName, G_DIR_SEPARATOR_S,tmp);
 		else
 			fileNameTraj = g_strdup_printf("%s%s",dirName, tmp);
@@ -4838,7 +4843,7 @@ static void semiEmpiricalMD(GtkWidget* W
 	if(GTK_TOGGLE_BUTTON (buttonSaveProp)->active)
 	{
 		gchar* tmp = g_strdup(gtk_entry_get_text(GTK_ENTRY(entryFileNameProp)));
-		if(dirName[strlen(dirName)-1] != G_DIR_SEPARATOR)
+		if(dirName && dirName[strlen(dirName)-1] != G_DIR_SEPARATOR)
 			fileNameProp = g_strdup_printf("%s%s%s",dirName, G_DIR_SEPARATOR_S,tmp);
 		else
 			fileNameProp = g_strdup_printf("%s%s",dirName, tmp);