Let's find out what that invalid argument exception is, should it recur.

git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@3665 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/java/com/threerings/presents/server/net/ConnectionManager.java

@@ -436,6 +436,10 @@ public class ConnectionManager extends LoopingThread
 
         } catch (IOException ioe) {
             Log.warning("Failure select()ing [ioe=" + ioe + "].");
+            if ("Invalid argument".equals(ioe.getMessage())) {
+                // what is this, anyway?
+                Log.logStackTrace(ioe);
+            }
             return;
 
         } catch (RuntimeException re) {