diff --git a/imagescrollareagl.cpp b/imagescrollareagl.cpp
index 8d11a5d..18f99cc 100644
--- a/imagescrollareagl.cpp
+++ b/imagescrollareagl.cpp
@@ -335,6 +335,7 @@ void ImageWidget::paintGL()
 
     if(m_showThumbnails)
     {
+        f->glClear(GL_COLOR_BUFFER_BIT);
         m_vaoThumb->bind();
         m_thumbnailTexture->bind(1);
         if(m_sizesDirty)
diff --git a/libXISF b/libXISF
index 922d4b7..d00de20 160000
--- a/libXISF
+++ b/libXISF
@@ -1 +1 @@
-Subproject commit 922d4b73c946f62564f363b9fab9670fec660880
+Subproject commit d00de2041d94171a55f4af18696e84738be30fef