diff --git a/doomsday/libs/gui/src/graphics/glshader.cpp b/doomsday/libs/gui/src/graphics/glshader.cpp
index fe8050979f..477ab2525b 100644
--- a/doomsday/libs/gui/src/graphics/glshader.cpp
+++ b/doomsday/libs/gui/src/graphics/glshader.cpp
@@ -43,7 +43,7 @@ DENG2_PIMPL(GLShader)
     {
         if (!name)
         {
-            name = LIBGUI_GL.glCreateShader(type == Vertex ?   GL_VERTEX_SHADER
+            name = LIBGUI_GL.glCreateShader(type == Vertex   ? GL_VERTEX_SHADER
                                           : type == Geometry ? GL_GEOMETRY_SHADER
                                                              : GL_FRAGMENT_SHADER);
             LIBGUI_ASSERT_GL_OK();
@@ -221,6 +221,17 @@ void GLShader::compile(Type shaderType, IByteArray const &shaderSource)
         Block log{Block::Size(logSize)};
         LIBGUI_GL.glGetShaderInfoLog(d->name, logSize, &count, reinterpret_cast<GLchar *>(log.data()));
 
+#if defined (DENG2_DEBUG)
+        {
+            QTextStream ins(src);
+            int lineNum = 1;
+            while (!ins.atEnd())
+            {
+                qDebug("%4i: %s", lineNum++, ins.readLine().toLatin1().constData());
+            }
+        }
+#endif
+
         throw CompilerError("GLShader::compile",
                             "Compilation of " + String(d->type == Fragment? "fragment" :
                                                        d->type == Geometry? "geometry" :
diff --git a/doomsday/libs/gui/src/graphics/glshaderbank.cpp b/doomsday/libs/gui/src/graphics/glshaderbank.cpp
index 5783e612a4..129f50234e 100644
--- a/doomsday/libs/gui/src/graphics/glshaderbank.cpp
+++ b/doomsday/libs/gui/src/graphics/glshaderbank.cpp
@@ -33,6 +33,11 @@
 
 namespace de {
 
+//static int countLines(String const &text)
+//{
+//    return text.count(QChar('\n'));
+//}
+
 static String processIncludes(String source, String const &sourceFolderPath)
 {
     QRegularExpression const re("#include\\s+['\"]([^\"']+)['\"]");
@@ -46,7 +51,8 @@ static String processIncludes(String source, String const &sourceFolderPath)
         incSource = processIncludes(incSource, incFilePath.fileNamePath());
 
         Rangei const capRange(found.capturedStart(), found.capturedEnd());
-        source = source.substr(0, capRange.start)
+        String const prefix = source.substr(0, capRange.start);
+        source = prefix //+ String::format("#line %i\n", countLines(prefix))
                + incSource
                + source.substr(capRange.end);
     }
diff --git a/doomsday/libs/gui/src/graphics/modeldrawable.cpp b/doomsday/libs/gui/src/graphics/modeldrawable.cpp
index 11645c31a8..4f0812ddf8 100644
--- a/doomsday/libs/gui/src/graphics/modeldrawable.cpp
+++ b/doomsday/libs/gui/src/graphics/modeldrawable.cpp
@@ -1685,6 +1685,15 @@ void ModelDrawable::drawInstanced(GLBuffer const &instanceAttribs,
     {
         d->drawInstanced(instanceAttribs, animation);
     }
+#if defined (DENG2_DEBUG)
+    else
+    {
+        qDebug() << "[ModelDrawable] drawInstanced isReady:"
+                 << isReady()
+                 << "program:" << d->program
+                 << "atlas:" << d->glData.textureBank.atlas();
+    }
+#endif
 }
 
 ModelDrawable::Pass const *ModelDrawable::currentPass() const