diff --git a/src/python/adgui.py b/src/python/adgui.py
index 0b7d5dfe..9d704a7d 100755
--- a/src/python/adgui.py
+++ b/src/python/adgui.py
@@ -241,8 +241,8 @@ class adgui(QObject):
         # level to color mapping
         colors = [
             '#804040', # MSG_EXT_ERROR
-            '#603030', # MSG_ERROR
-            '#605000', # MSG_WARNING
+            '#A03030', # MSG_ERROR
+            '#A08000', # MSG_WARNING
             '#000000', # MSG_INFO
             '#006000', # MSG_NOTICE
             '#005030', # MSG_NOTICE2
@@ -463,12 +463,22 @@ class adgui(QObject):
             self.pgm.teardown()
 
     def read_signature(self):
+        sig_ok = "background-color: rgb(255, 255, 255);\ncolor: rgb(0, 100, 0);"
+        sig_bad = "background-color: rgb(255, 255, 255);\ncolor: rgb(150, 0, 0);"
         if self.connected:
             m = ad.avr_locate_mem(self.dev, 'signature')
             if m:
                 ad.avr_read_mem(self.pgm, self.dev, m)
                 self.progress_callback(100, 0, "", 0) # clear progress bar
                 read_sig = m.get(3)
+                if read_sig == self.dev.signature:
+                    self.memories.deviceSig.setStyleSheet(sig_ok)
+                else:
+                    self.memories.deviceSig.setStyleSheet(sig_bad)
+                    self.log("Signature read from device does not match config file",
+                             ad.MSG_WARNING)
+                self.memories.flash.setEnabled(True)
+                self.memories.eeprom.setEnabled(True)
                 sigstr = read_sig.hex(' ').upper()
                 self.memories.deviceSig.setText(sigstr)
                 p = ad.locate_part_by_signature(ad.cvar.part_list, read_sig)
diff --git a/src/python/memories.ui b/src/python/memories.ui
index 5e747c59..55ed963e 100644
--- a/src/python/memories.ui
+++ b/src/python/memories.ui
@@ -33,6 +33,9 @@
    </property>
   </widget>
   <widget class="QTabWidget" name="tabWidget">
+   <property name="enabled">
+    <bool>true</bool>
+   </property>
    <property name="geometry">
     <rect>
      <x>30</x>
@@ -182,7 +185,7 @@
    </widget>
    <widget class="QWidget" name="flash">
     <property name="enabled">
-     <bool>true</bool>
+     <bool>false</bool>
     </property>
     <attribute name="title">
      <string>Flash</string>
@@ -434,6 +437,9 @@
     </widget>
    </widget>
    <widget class="QWidget" name="eeprom">
+    <property name="enabled">
+     <bool>false</bool>
+    </property>
     <attribute name="title">
      <string>EEPROM</string>
     </attribute>