diff --git a/batterym/misc.py b/batterym/misc.py
index 98c3320..43b273f 100644
--- a/batterym/misc.py
+++ b/batterym/misc.py
@@ -56,6 +56,24 @@ def remove_front_lines_if_too_many(fname, lines_threshold=None):
         write_lines_to_file(lines, fname)
 
 
+def get_mod(path):
+    return os.stat(path).st_mode & 0777
+
+
+def change_mod(path, mod):
+    print 'changing mode of {0} to {1}'.format(path, oct(mod))
+    os.chmod(path, mod)
+    if mod != get_mod(path):
+        raise ValueError
+
+
+def change_mod_files(folder, mod):
+    for fname in os.listdir(folder):
+        path = os.path.join(folder, fname)
+        if os.path.isfile(path):
+            change_mod(path, mod)
+
+
 class MyTest(unittest.TestCase):
 
     def setUp(self):
@@ -67,14 +85,34 @@ def tearDown(self):
         if os.path.isfile(self.fname):
             os.remove(self.fname)
 
+    def test_chmod(self):
+        src = 0775
+        change_mod(self.fname, src)
+        result = get_mod(self.fname)
+        self.assertEqual(src, result)
+
     def test_write_read(self):
         src = []
+        expected = '\n'
         write_lines_to_file(src, self.fname)
+        result = read_from_file(self.fname)
+        self.assertEqual(result, expected)
         result = read_lines_from_file(self.fname)
         self.assertEqual(src, result)
 
         src = ['abc']
+        expected = 'abc\n'
         write_lines_to_file(src, self.fname)
+        result = read_from_file(self.fname)
+        self.assertEqual(result, expected)
+        result = read_lines_from_file(self.fname)
+        self.assertEqual(src, result)
+
+        src = ['1', '2', '3']
+        expected = '1\n2\n3\n'
+        write_lines_to_file(src, self.fname)
+        result = read_from_file(self.fname)
+        self.assertEqual(result, expected)
         result = read_lines_from_file(self.fname)
         self.assertEqual(src, result)
 
diff --git a/config/config.json b/config/config.json
index f90d907..4d5f38f 100644
--- a/config/config.json
+++ b/config/config.json
@@ -3,5 +3,5 @@
   "theme": "dark", 
   "smoothing": true,
   "log_capacity_lines_limit": 1500,
-  "version": "1.0.0"
+  "version": "1.0.1"
 }
\ No newline at end of file
diff --git a/release-notes.md b/release-notes.md
index cc6b7ad..dca29b0 100644
--- a/release-notes.md
+++ b/release-notes.md
@@ -1,5 +1,7 @@
 Release Notes
 -------------
+#### v1.0.1 (2017-04-16)
+- Fix #16: File permission issue 
 
 #### v1.0.0 (2017-04-14)
 - Preserve history after reinstall
diff --git a/setup.py b/setup.py
index b1ab470..ab8b0a9 100644
--- a/setup.py
+++ b/setup.py
@@ -2,6 +2,7 @@
 import os
 from distutils.core import setup
 from batterym.misc import append_to_file
+from batterym.misc import change_mod_files
 from batterym.misc import create_missing_dirs
 
 from batterym.paths import SHARE_APP_DIR
@@ -51,6 +52,7 @@ def chmod(folder, mod):
 append_to_file('', LOG_BATTERY_FILE)
 append_to_file('', LOG_BATTERY_ALL_FILE)
 
-chmod(CONFIG_DIR, 0777)
-chmod(LOGS_DIR, 0777)
-chmod(IMAGE_DIR, 0777)
+mod = 0775
+change_mod_files(CONFIG_DIR, mod)
+change_mod_files(LOGS_DIR, mod)
+change_mod_files(IMAGE_DIR, mod)