diff --git a/flatpak/README.md b/flatpak/README.md
index e0994b1..43f672d 100644
--- a/flatpak/README.md
+++ b/flatpak/README.md
@@ -33,7 +33,7 @@ If not already installed, install the builder and the flathub repository:
 Install the runtime environments:
     
     flatpak install org.freedesktop.Sdk/x86_64/25.08
-    flatpak install org.freedesktop.Platform/25.08
+    flatpak install org.freedesktop.Platform/x86_64/25.08
 
 
 ### 2. Build vimix flatpak
diff --git a/src/ImGuiVisitor.cpp b/src/ImGuiVisitor.cpp
index 4d5d6e0..3ecce48 100644
--- a/src/ImGuiVisitor.cpp
+++ b/src/ImGuiVisitor.cpp
@@ -432,8 +432,14 @@ void ImGuiVisitor::visit (Source& s)
         }
         // centered image
         if (s.ready()) {
-            ImGui::SetCursorPos( ImVec2(pos.x + 0.5f * (preview_width-width), pos.y + 0.5f * (preview_height-height-space)) );
+            ImVec2 dpos = ImVec2(pos.x + 0.5f * (preview_width-width), pos.y + 0.5f * (preview_height-height-space));
+            ImGui::SetCursorPos( dpos );
             ImGui::Image((void*)(uintptr_t) s.frame()->texture(), ImVec2(width, height));
+            if (ImGui::IsItemHovered()) {
+                ImGui::SetCursorPos( dpos );
+                ImGui::Image((void*)(uintptr_t) s.texture(), ImVec2(width, height));
+                ImGuiToolkit::ToolTip("Source original image");
+            }
         } else {
             ImGuiToolkit::PushFont(ImGuiToolkit::FONT_LARGE);
             ImGui::SetCursorPos(
diff --git a/src/SessionCreator.cpp b/src/SessionCreator.cpp
index 83f8444..2914f73 100644
--- a/src/SessionCreator.cpp
+++ b/src/SessionCreator.cpp
@@ -1145,6 +1145,7 @@ void SessionLoader::visit (Source& s)
 
 void SessionLoader::visit (MediaSource& s)
 {
+    bool freshload = false;
     // set uri
     XMLElement* pathNode = xmlCurrent_->FirstChildElement("uri"); // TODO change to "path" but keep backward compatibility
     if (pathNode) {
@@ -1162,6 +1163,7 @@ void SessionLoader::visit (MediaSource& s)
                     }
                 }
                 s.setPath(path);
+                freshload = true;
             }
         }
         // ensures the source is initialized even if no valid path is given
@@ -1178,7 +1180,8 @@ void SessionLoader::visit (MediaSource& s)
     s.mediaplayer()->setRate(1.0); 
     // add a callback to activate source play speed and rewind
     s.call( new PlaySpeed( r ) );
-    s.call( new RePlay( ) );
+    if (freshload)
+        s.call( new RePlay( ) );
 }
 
 void SessionLoader::visit (SessionFileSource& s)
diff --git a/src/SourceControlWindow.cpp b/src/SourceControlWindow.cpp
index 67c50e1..d8f0734 100644
--- a/src/SourceControlWindow.cpp
+++ b/src/SourceControlWindow.cpp
@@ -471,7 +471,8 @@ void SourceControlWindow::Render()
                 mediaplayer_active_->timeline()->clearFading();
                 mediaplayer_active_->timeline()->clearGaps();
                 mediaplayer_active_->timeline()->clearFlags();
-                mediaplayer_active_->setVideoEffect("");
+                if (!mediaplayer_active_->videoEffect().empty() && mediaplayer_active_->videoEffectAvailable())
+                    mediaplayer_active_->setVideoEffect("");
                 std::ostringstream oss;
                 oss << SystemToolkit::base_filename( mediaplayer_active_->filename() );
                 oss << ": Reset timeline";