diff --git a/README b/README
--- a/README
+++ b/README
@@ -56,6 +56,9 @@
    would allow the user to catch the idle times more exactly.
  * Rules based on day of time, to create tags for worktime, weekend, late
    at night. (Partially done)
+ * Storing the current timezone in the tags, for the prevoius entry to be
+   more to be more useful.
+ * Storing the hostname, in case a user has several. 
  * Statistics based on time, to visualize trends.
  * Possibly more data sources?
 
diff --git a/arbtt.cabal b/arbtt.cabal
--- a/arbtt.cabal
+++ b/arbtt.cabal
@@ -1,5 +1,5 @@
 name:               arbtt
-version:            0.4.3
+version:            0.4.4
 license:            GPL
 license-file:       LICENSE
 category:           Desktop
diff --git a/categorize.cfg b/categorize.cfg
--- a/categorize.cfg
+++ b/categorize.cfg
@@ -32,6 +32,8 @@
   ==> tag Project:DA,
 current window $title =~ m!Diplomarbeit.pdf!
   ==> tag Project:DA,
+current window $title =~ m!LoopSubgroupPaper.pdf!
+  ==> tag Project:DA,
 
 -- Out of curiosity: what percentage of my time am I actually coding Haskell?
 current window ($program == "gvim" && $title =~ /^[^ ]+\.hs \(/ )
diff --git a/doc/arbtt.xml b/doc/arbtt.xml
--- a/doc/arbtt.xml
+++ b/doc/arbtt.xml
@@ -815,6 +815,19 @@
   </para>
 
   <sect2>
+    <title>Version 0.4.4</title>
+    <itemizedlist>
+      <listitem>
+        <para>Bugfix: Correctly parse a tag name containing a colon when passed to <command>arbtt-stats</command> <option>--exclude</option>.</para>
+      </listitem>
+      <listitem>
+        <para>Bugfix: Only warn once when the <token>_NET_CLIENT_LIST</token> X property is not set for the root window.</para>
+      </listitem>
+    </itemizedlist>
+  </sect2>
+
+
+  <sect2>
     <title>Version 0.4.3</title>
     <itemizedlist>
       <listitem>
diff --git a/src/Capture.hs b/src/Capture.hs
--- a/src/Capture.hs
+++ b/src/Capture.hs
@@ -11,6 +11,17 @@
 import Data.Time.Clock
 import System.IO
 
+setupChecks :: IO ()
+setupChecks = do
+	dpy <- openDisplay ""
+        xSetErrorHandler
+	let rwin = defaultRootWindow dpy
+	a <- internAtom dpy "_NET_CLIENT_LIST" False
+	p <- getWindowProperty32 dpy a rwin
+	when (isNothing p) $ do
+		hPutStrLn stderr "arbtt: ERROR: No _NET_CLIENT_LIST set for the root window"
+	closeDisplay dpy
+
 captureData :: IO CaptureData
 captureData = do
 	dpy <- openDisplay ""
@@ -22,8 +33,7 @@
 
 	wins <- case p of
 		Just wins -> return (map fromIntegral wins)
-		Nothing -> do hPutStrLn stderr "arbtt: ERROR: No _NET_CLIENT_LIST set for the root window"
-		              return []
+		Nothing   -> return []
 
 	(fsubwin,_) <- getInputFocus dpy
 	fwin <- followTreeUntil dpy (`elem` wins) fsubwin
diff --git a/src/Stats.hs b/src/Stats.hs
--- a/src/Stats.hs
+++ b/src/Stats.hs
@@ -14,13 +14,13 @@
 
 
 data Report = GeneralInfos | TotalTime | Category String | EachCategory
-        deriving Eq
+        deriving (Show, Eq)
 
 data Filter = Exclude Activity | Only Activity | AlsoInactive | GeneralCond String
-        deriving Eq
+        deriving (Show, Eq)
 
 data ReportOption = MinPercentage Double
-        deriving Eq
+        deriving (Show, Eq)
 
 -- Data format semantically representing the result of a report, including the
 -- title
diff --git a/src/capture-main.hs b/src/capture-main.hs
--- a/src/capture-main.hs
+++ b/src/capture-main.hs
@@ -78,4 +78,5 @@
     let captureFile = dir </> "capture.log"
     lockFile captureFile
     upgradeLogFile1 captureFile
+    setupChecks
     runLogger captureFile (sampleRate * 1000) captureData
diff --git a/src/stats-main.hs b/src/stats-main.hs
--- a/src/stats-main.hs
+++ b/src/stats-main.hs
@@ -44,7 +44,7 @@
 	      "show the version number"
 --     , Option ['g']     ["graphical"] (NoArg Graphical)    "render the reports as graphical charts"
      , Option "x"       ["exclude"]
-              (ReqArg (Filter . Exclude . Activity Nothing) "TAG")
+              (ReqArg (Filter . Exclude . read) "TAG")
 	      "ignore samples containing this tag"
      , Option "o"       ["only"]
               (ReqArg (Filter . Only . read) "TAG")