diff --git a/src/calibre/devices/kobo/driver.py b/src/calibre/devices/kobo/driver.py
index 0eddf26549..b76ee4b1c3 100644
--- a/src/calibre/devices/kobo/driver.py
+++ b/src/calibre/devices/kobo/driver.py
@@ -79,11 +79,11 @@ class KOBO(USBMS):
 
         # Determine the firmware version
         f = open(self.normalize_path(self._main_prefix + '.kobo/version'), 'r')
-        fwversion = f.readline().split(',')[2]
+        self.fwversion = f.readline().split(',')[2]
         f.close()
-        if fwversion != '1.0' and fwversion != '1.4':
+        if self.fwversion != '1.0' and self.fwversion != '1.4':
             self.has_kepubs = True
-        debug_print('Version of firmware: ', fwversion, 'Has kepubs:', self.has_kepubs)
+        debug_print('Version of firmware: ', self.fwversion, 'Has kepubs:', self.has_kepubs)
 
         self.booklist_class.rebuild_collections = self.rebuild_collections
 
@@ -220,6 +220,7 @@ class KOBO(USBMS):
         #    2) volume_shorcover
         #    2) content
 
+        debug_print('delete_via_sql: ContentID: ', ContentID, 'ContentType: ', ContentType) 
         connection = sqlite.connect(self.normalize_path(self._main_prefix + '.kobo/KoboReader.sqlite'))
         cursor = connection.cursor()
         t = (ContentID,)
@@ -400,6 +401,12 @@ class KOBO(USBMS):
         elif extension == '.pdf' or extension == '.epub':
             # print "ePub or pdf"
             ContentType = 16
+        elif extension == '.rtf' or extension == '.txt' or extension == '.htm' or extension == '.html':
+            # print "txt"
+            if self.fwversion == '1.0' or self.fwversion == '1.4' or self.fwversion == '1.7.4':
+                ContentType = 999
+            else:
+                ContentType = 901
         else: # if extension == '.html' or extension == '.txt':
             ContentType = 999 # Yet another hack: to get around Kobo changing how ContentID is stored
         return ContentType
diff --git a/src/calibre/ebooks/oeb/stylizer.py b/src/calibre/ebooks/oeb/stylizer.py
index d10ea12394..4f8ae68943 100644
--- a/src/calibre/ebooks/oeb/stylizer.py
+++ b/src/calibre/ebooks/oeb/stylizer.py
@@ -240,18 +240,26 @@ class Stylizer(object):
             else:
                 for elem in matches:
                     self.style(elem)._update_cssdict(cssdict)
-        for elem in xpath(tree, '//h:img[@width or @height]'):
-            base = elem.get('style', '').strip()
-            if base:
-                base += ';'
-            for prop in ('width', 'height'):
-                val = elem.get(prop, False)
-                if val:
-                    base += '%s: %s;'%(prop, val)
-                    del elem.attrib[prop]
-            elem.set('style', base)
         for elem in xpath(tree, '//h:*[@style]'):
             self.style(elem)._apply_style_attr()
+        num_pat = re.compile(r'\d+$')
+        for elem in xpath(tree, '//h:img[@width or @height]'):
+            style = self.style(elem)
+            # Check if either height or width is not default
+            is_styled = style._style.get('width', 'auto') != 'auto' or \
+                    style._style.get('height', 'auto') != 'auto'
+            if not is_styled:
+                # Update img style dimension using width and height
+                upd = {}
+                for prop in ('width', 'height'):
+                    val = elem.get(prop, '').strip()
+                    del elem.attrib[prop]
+                    if val:
+                        if num_pat.match(val) is not None:
+                            val += 'px'
+                        upd[prop] = val
+                if upd:
+                    style._update_cssdict(upd)
 
     def _fetch_css_file(self, path):
         hrefs = self.oeb.manifest.hrefs
diff --git a/src/calibre/gui2/actions/add.py b/src/calibre/gui2/actions/add.py
index 5cc72c3ff0..9b348d8285 100644
--- a/src/calibre/gui2/actions/add.py
+++ b/src/calibre/gui2/actions/add.py
@@ -18,6 +18,7 @@ from calibre.ebooks import BOOK_EXTENSIONS
 from calibre.utils.filenames import ascii_filename
 from calibre.constants import preferred_encoding, filesystem_encoding
 from calibre.gui2.actions import InterfaceAction
+from calibre.gui2 import config
 
 class AddAction(InterfaceAction):
 
@@ -101,7 +102,12 @@ class AddAction(InterfaceAction):
             else:
                 ids.add(db.import_book(mi, []))
         self.gui.library_view.model().books_added(len(books))
-        self.gui.iactions['Edit Metadata'].do_download_metadata(ids)
+        orig = config['overwrite_author_title_metadata']
+        config['overwrite_author_title_metadata'] = True
+        try:
+            self.gui.iactions['Edit Metadata'].do_download_metadata(ids)
+        finally:
+            config['overwrite_author_title_metadata'] = orig
 
 
     def files_dropped(self, paths):