diff --git a/src/calibre/devices/prs505/driver.py b/src/calibre/devices/prs505/driver.py
index 1ff17e8cbb..d88aba00d0 100644
--- a/src/calibre/devices/prs505/driver.py
+++ b/src/calibre/devices/prs505/driver.py
@@ -26,7 +26,7 @@ class PRS505(CLI, Device):
     PRODUCT_ID   = [0x031e]   #: Product Id for the PRS-505
     BCD          = [0x229, 0x1000]  #: Needed to disambiguate 505 and 700 on linux
 
-    VENDOR_NAME  = 'SONY'
+    VENDOR_NAME        = 'SONY'
     WINDOWS_MAIN_MEM   = 'PRS-505'
     WINDOWS_CARD_A_MEM = ['PRS-505/UC:MS', 'PRS-505/CE:MS']
     WINDOWS_CARD_B_MEM = ['PRS-505/UC:SD', 'PRS-505/CE:SD']
diff --git a/src/calibre/ebooks/__init__.py b/src/calibre/ebooks/__init__.py
index b24b74f48c..d2d6fc94e1 100644
--- a/src/calibre/ebooks/__init__.py
+++ b/src/calibre/ebooks/__init__.py
@@ -23,7 +23,7 @@ class DRMError(ValueError):
     pass
 
 BOOK_EXTENSIONS = ['lrf', 'rar', 'zip', 'rtf', 'lit', 'txt', 'htm', 'xhtm',
-                   'html', 'xhtml', 'pdf', 'prc', 'mobi', 'azw', 'doc',
+                   'html', 'xhtml', 'pdf', 'pdb', 'prc', 'mobi', 'azw', 'doc',
                    'epub', 'fb2', 'djvu', 'lrx', 'cbr', 'cbz', 'oebzip',
                    'rb', 'imp', 'odt']
 
diff --git a/src/calibre/gui2/convert/lrf_output.py b/src/calibre/gui2/convert/lrf_output.py
index 2f53393401..1f52598b93 100644
--- a/src/calibre/gui2/convert/lrf_output.py
+++ b/src/calibre/gui2/convert/lrf_output.py
@@ -49,4 +49,5 @@ class PluginWidget(Widget, Ui_Form):
             if idx < 0:
                 idx = 0
             g.setCurrentIndex(0)
+            return True
         return False