diff --git a/research/gtk-style-experiment.cpp b/research/gtk-style-experiment.cpp
index ffc11f85c..466919197 100644
--- a/research/gtk-style-experiment.cpp
+++ b/research/gtk-style-experiment.cpp
@@ -44,6 +44,7 @@
 #include "lib/error.hpp"
 #include "lib/util.hpp"
 
+#include <gtk/gtk.h> ////////////////////TODO WIP
 #include <string>
 
 using util::cStr;
@@ -218,6 +219,7 @@ namespace research {
     
     Gtk::WidgetPath path = srcWidget.get_path();
     PStyleContext style = Gtk::StyleContext::create();
+    style->set_screen(Gdk::Screen::get_default());
     style->set_path(path);
 //  style->add_class(slopeClassName(2));
     return style;
@@ -317,8 +319,14 @@ namespace research {
         {
           int marT = style_->get_margin().get_top();
           
+          auto path = style_->get_path();
+          
           if (xBorderSiz > 1) {
-            style_->context_save();
+//          style_->invalidate();
+//          style_->context_save();
+//          style_->set_screen(Gdk::Screen::get_default());
+//          style_->set_path(path);
+//          style_->invalidate();
             style_->add_class(slopeClassName(xBorderSiz));            
           }
           
@@ -335,7 +343,8 @@ namespace research {
                                );
           
           if (xBorderSiz > 1) {
-            style_->context_restore();
+//          style_->context_restore();
+            style_->remove_class(slopeClassName(xBorderSiz));
           }
         }
         //////////////////TEST drawing via Gtk::StyleContext
diff --git a/src/stage/timeline/body-canvas-widget.cpp b/src/stage/timeline/body-canvas-widget.cpp
index 09b1569bf..b4f2c6753 100644
--- a/src/stage/timeline/body-canvas-widget.cpp
+++ b/src/stage/timeline/body-canvas-widget.cpp
@@ -219,7 +219,7 @@ namespace timeline {
         void
         close (uint n)  override
           {
-//            style_->context_save();
+//          style_->context_save();                // <<<---does not work. Asked on SO: https://stackoverflow.com/q/57342478
             style_->add_class (slopeClassName(n));
             style_->invalidate();
             int slopeWidth = style_->get_border().get_bottom();
@@ -235,8 +235,8 @@ namespace timeline {
                                  ,visible_.b
                                  ,visible_.e
                                  );
+//          style_->context_restore();             // <<<---does not work...
             style_->remove_class (slopeClassName(n));
-//            style_->context_restore();
             line_ += slopeWidth;
           }
         
diff --git a/src/stage/workspace/ui-style.cpp b/src/stage/workspace/ui-style.cpp
index 6839ce0ad..06b3b4a95 100644
--- a/src/stage/workspace/ui-style.cpp
+++ b/src/stage/workspace/ui-style.cpp
@@ -139,6 +139,7 @@ namespace workspace {
     for (int i=0; i<pos; ++i)                                            // reset any state flags accidentally set (resulting in pseudo classes like ":backdrop")
       gtk_widget_path_iter_set_state(path.gobj(), i, GTK_STATE_FLAG_NORMAL);
     PStyleContext style = Gtk::StyleContext::create();                   // create a new style context and configure it according to the path defined thus far
+    style->set_screen(Gdk::Screen::get_default());
     style->set_path (path);
     styleAdviceTrackBody_.setAdvice (style);                             // publish as Advice "style(trackBody)"
     INFO (stage, "Body-CSS: path=%s", util::cStr (path.to_string()));    ////////////////////////TICKET #1201 : this yields "paned:dir-ltr.horizontal box:dir-ltr.vertical TrackScope.timeline"
diff --git a/wiki/thinkPad.ichthyo.mm b/wiki/thinkPad.ichthyo.mm
index dede9aef4..40a4b9859 100644
--- a/wiki/thinkPad.ichthyo.mm
+++ b/wiki/thinkPad.ichthyo.mm
@@ -23026,10 +23026,58 @@
 <icon BUILTIN="idea"/>
 </node>
 </node>
-<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1564841527588" ID="ID_1377435126" MODIFIED="1564841582490" TEXT="TODO: Untersuchung context_save() auf einem kopierten / frei konstruierten StyleContext">
-<icon BUILTIN="flag-yellow"/>
+<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1564841527588" ID="ID_1377435126" MODIFIED="1564868164039" TEXT="Untersuchung context_save() auf einem kopierten / frei konstruierten StyleContext">
+<icon BUILTIN="pencil"/>
+<node CREATED="1564868166273" ID="ID_945377761" MODIFIED="1564868267923" TEXT="kann das problematische Verhalten reproduzieren">
+<richcontent TYPE="NOTE"><html>
+  <head>
+    
+  </head>
+  <body>
+    <p>
+      Wenn man einen neuen Gtk::StyleContext erzeugt,
+    </p>
+    <p>
+      und (wie in der Doku beschrieben) den path und den screen manuell setzt,
+    </p>
+    <p>
+      dann f&#252;hrt ein context_save() dazu, da&#223; pl&#246;tzlich die CSS-Werte auf Defaults zur&#252;ckspringen
+    </p>
+  </body>
+</html>
+</richcontent>
 </node>
-<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1564841584180" ID="ID_1444331441" MODIFIED="1564841601195" TEXT="TODO: Untersuchung wie box-shadow gerendert wird">
+<node CREATED="1564868280687" ID="ID_593595518" MODIFIED="1564871156101" TEXT="es hilft nichts, wenn man den Screen (nochmal) setzt">
+<richcontent TYPE="NOTE"><html>
+  <head>
+    
+  </head>
+  <body>
+    <p>
+      und ja, den Screen sollte man generell setzten.<br />Steht auch so in der Doku.
+    </p>
+    <p>
+      
+    </p>
+    <p>
+      Allerdings hat es bisher auch ohne das bei mir funktioniert.
+    </p>
+  </body>
+</html>
+</richcontent>
+<icon BUILTIN="broken-line"/>
+</node>
+<node CREATED="1564868338325" ID="ID_1826179725" MODIFIED="1564871159899" TEXT="es hilft nichts, wenn man den Pfad erneut setzt">
+<icon BUILTIN="broken-line"/>
+</node>
+<node CREATED="1564868348236" ID="ID_1509661918" MODIFIED="1564871163619" TEXT="es hilft nichts, wenn man den Context invalidiert">
+<icon BUILTIN="broken-line"/>
+</node>
+<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1564871053125" HGAP="30" ID="ID_1611854805" LINK="https://stackoverflow.com/q/57342478/444796" MODIFIED="1564871092888" TEXT="habe auf Stackoverflow gefragt" VSHIFT="16">
+<icon BUILTIN="hourglass"/>
+</node>
+</node>
+<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1564841584180" ID="ID_1444331441" MODIFIED="1564866024773" TEXT="TODO: Untersuchung wie box-shadow gerendert wird">
 <icon BUILTIN="flag-yellow"/>
 </node>
 </node>