diff --git a/src/CommPort.cpp b/src/CommPort.cpp
index b590c5eee..c4ecdd311 100644
--- a/src/CommPort.cpp
+++ b/src/CommPort.cpp
@@ -33,15 +33,18 @@ CommPort::addListFunction(ListFunction f)
 QVector<CommPortPtr>
 CommPort::listCommPorts(QString &err)
 {
-    err = "";
+    QStringList errors;
     QVector<CommPortPtr> result;
     for (int i = 0; listFunctions && i < listFunctions->size(); ++i) {
-        QVector<CommPortPtr> tmp = (*listFunctions)[i](err);
-        if (err == "")
+        QString thisError = "";
+        QVector<CommPortPtr> tmp = (*listFunctions)[i](thisError);
+        if (thisError == "")
             result << tmp;
         else
-            err += "\n";
+            errors << thisError;
     }
+    if (result.isEmpty() && !errors.isEmpty())
+        err = errors.join("\n");
     return result;
 }
 
diff --git a/src/DownloadRideDialog.cpp b/src/DownloadRideDialog.cpp
index babc9262d..304f0c2e0 100644
--- a/src/DownloadRideDialog.cpp
+++ b/src/DownloadRideDialog.cpp
@@ -106,8 +106,8 @@ DownloadRideDialog::scanCommPorts()
     QString err;
     devList = CommPort::listCommPorts(err);
     if (err != "") {
-        QString msg = "Warning:\n\n" + err + "You may need to (re)install "
-            "the FTDI drivers before downloading.";
+        QString msg = "Warning(s):\n\n" + err + "\n\nYou may need to (re)install "
+            "the FTDI or PL2303 drivers before downloading.";
         QMessageBox::warning(0, "Error Loading Device Drivers", msg, 
                              QMessageBox::Ok, QMessageBox::NoButton);
     }
diff --git a/src/Serial.cpp b/src/Serial.cpp
index b01c57592..f1340df96 100644
--- a/src/Serial.cpp
+++ b/src/Serial.cpp
@@ -398,6 +398,8 @@ Serial::myListCommPorts(QString &err)
     QVector<CommPortPtr> result;
     char *devices[MAX_DEVICES];
     int devcnt = find_devices(devices, MAX_DEVICES);
+    if (devcnt == 0)
+        err = "No serial devices found.";
     for (int i = 0; i < devcnt; ++i) {
         result.append(CommPortPtr(new Serial(devices[i])));
         free(devices[i]);