diff --git a/src/attica/atticaprovider.cpp b/src/attica/atticaprovider.cpp
--- a/src/attica/atticaprovider.cpp
+++ b/src/attica/atticaprovider.cpp
@@ -446,6 +446,8 @@
     if (job->metadata().error() == Attica::Metadata::OcsError) {
         if (job->metadata().statusCode() == 200) {
             emit signalErrorCode(KNSCore::OcsError, i18n("Too many requests to server. Please try again in a few minutes."), job->metadata().statusCode());
+        } else if (job->metadata().statusCode() == 405) {
+            emit signalErrorCode(KNSCore::OcsError, i18n("The Open Collaboration Services instance %1 does not support the attempted function.").arg(name()), job->metadata().statusCode());
         } else {
             emit signalErrorCode(KNSCore::OcsError, i18n("Unknown Open Collaboration Service API error. (%1)", job->metadata().statusCode()), job->metadata().statusCode());
         }
diff --git a/src/ui/itemsviewdelegate.cpp b/src/ui/itemsviewdelegate.cpp
--- a/src/ui/itemsviewdelegate.cpp
+++ b/src/ui/itemsviewdelegate.cpp
@@ -280,8 +280,11 @@
     if (rating) {
         if (entry.rating() > 0) {
             rating->setToolTip(i18n("Rating: %1%", entry.rating()));
+            // Don't attempt to send a rating to the server if we're just updating the UI
+            rating->blockSignals(true);
             // assume all entries come with rating 0..100 but most are in the range 20 - 80, so 20 is 0 stars, 80 is 5 stars
             rating->setRating((entry.rating() - 20) * 10 / 60);
+            rating->blockSignals(true);
             // put the rating label below the install button
             rating->move(right - installButton->width() - margin, option.rect.height() / 2 + installButton->height() / 2);
             rating->resize(m_buttonSize);
diff --git a/src/ui/progressindicator.cpp b/src/ui/progressindicator.cpp
--- a/src/ui/progressindicator.cpp
+++ b/src/ui/progressindicator.cpp
@@ -24,6 +24,7 @@
 #include <QPushButton>
 #include <QLabel>
 #include <QLayout>
+#include <QVariant>
 
 #include "kjob.h"
 
@@ -59,8 +60,11 @@
     busyWidget->setSequence(m_busyPixmap);
 }
 
-void KNS3::ProgressIndicator::error(const KNSCore::ErrorCode& /*errorCode*/, const QString& message, const QVariant& /*metadata*/)
+void KNS3::ProgressIndicator::error(const KNSCore::ErrorCode& errorCode, const QString& message, const QVariant& metadata)
 {
+    if(errorCode == KNSCore::OcsError && metadata.value<int>() == 405) {
+        return;
+    }
     m_statusLabel->setText(message);
     busyWidget->setVisible(true);
     busyWidget->setSequence(m_errorPixmap);