diff --git a/library/modules/EventManager.cpp b/library/modules/EventManager.cpp
index d29a6627d..e882febf8 100644
--- a/library/modules/EventManager.cpp
+++ b/library/modules/EventManager.cpp
@@ -68,6 +68,7 @@ static int32_t eventLastTick[EventType::EVENT_MAX];
 static const int32_t ticksPerYear = 403200;
 
 void DFHack::EventManager::registerListener(EventType::EventType e, EventHandler handler, Plugin* plugin) {
+    DEBUG(log).print("registering handler %p from plugin %s for event %d\n", handler.eventHandler, plugin->getName().c_str(), e);
     handlers[e].insert(pair<Plugin*, EventHandler>(plugin, handler));
 }
 
@@ -83,6 +84,7 @@ int32_t DFHack::EventManager::registerTick(EventHandler handler, int32_t when, P
     }
     handler.freq = when;
     tickQueue.insert(pair<int32_t, EventHandler>(handler.freq, handler));
+    DEBUG(log).print("registering handler %p from plugin %s for event TICK\n", handler.eventHandler, plugin->getName().c_str());
     handlers[EventType::TICK].insert(pair<Plugin*,EventHandler>(plugin,handler));
     return when;
 }
@@ -108,6 +110,7 @@ void DFHack::EventManager::unregister(EventType::EventType e, EventHandler handl
             i++;
             continue;
         }
+        DEBUG(log).print("unregistering handler %p from plugin %s for event %d\n", handler.eventHandler, plugin->getName().c_str(), e);
         i = handlers[e].erase(i);
         if ( e == EventType::TICK )
             removeFromTickQueue(handler);
@@ -115,6 +118,7 @@ void DFHack::EventManager::unregister(EventType::EventType e, EventHandler handl
 }
 
 void DFHack::EventManager::unregisterAll(Plugin* plugin) {
+    DEBUG(log).print("unregistering all handlers for plugin %s\n", plugin->getName().c_str());
     for ( auto i = handlers[EventType::TICK].find(plugin); i != handlers[EventType::TICK].end(); i++ ) {
         if ( (*i).first != plugin )
             break;
diff --git a/library/modules/Gui.cpp b/library/modules/Gui.cpp
index c23d7712d..e75ab41af 100644
--- a/library/modules/Gui.cpp
+++ b/library/modules/Gui.cpp
@@ -2150,19 +2150,13 @@ bool Gui::setDesignationCoords (const int32_t x, const int32_t y, const int32_t
 df::coord Gui::getMousePos()
 {
     df::coord pos;
-/* TODO: understand how this changes for v50
-    if (gps && gps->mouse_x > -1) {
-        // return invalid coords if the cursor is not over the map
-        DwarfmodeDims dims = getDwarfmodeViewDims();
-        if (gps->mouse_x < dims.map_x1 || gps->mouse_x > dims.map_x2 ||
-                gps->mouse_y < dims.map_y1 || gps->mouse_y > dims.map_y2) {
-            return pos;
-        }
+    if (gps && gps->mouse_x_pixel > -1) {
         pos = getViewportPos();
-        pos.x += gps->mouse_x - 1;
-        pos.y += gps->mouse_y - 1;
-    }
+/* TODO: understand how this changes for v50
+        pos.x += gps->mouse_x_pixel / tile_width;
+        pos.y += gps->mouse_y_pixel / tile_height;
 */
+    }
     return pos;
 }
 
diff --git a/library/modules/Screen.cpp b/library/modules/Screen.cpp
index 38611e5ce..4d9c5a70d 100644
--- a/library/modules/Screen.cpp
+++ b/library/modules/Screen.cpp
@@ -76,26 +76,20 @@ using std::string;
  * Screen painting API.
  */
 
-// returns text grid coordinates, even if the game map is scaled differently
+// returns ui grid coordinates, even if the game map is scaled differently
 df::coord2d Screen::getMousePos()
 {
-    int32_t pixelx = 0, pixely = 0, tilex = 0, tiley = 0;
-    if (!enabler || !enabler->renderer->get_mouse_coords(
-            &pixelx, &pixely, &tilex, &tiley)) {
+    if (!gps)
         return df::coord2d(-1, -1);
-    }
-    return df::coord2d(tilex, tiley);
+    return df::coord2d(gps->mouse_x_tile, gps->mouse_y_tile);
 }
 
 // returns the screen pixel coordinates
 df::coord2d Screen::getMousePixels()
 {
-    int32_t pixelx = 0, pixely = 0, tilex = 0, tiley = 0;
-    if (!enabler || !enabler->renderer->get_mouse_coords(
-            &pixelx, &pixely, &tilex, &tiley)) {
+    if (!gps)
         return df::coord2d(-1, -1);
-    }
-    return df::coord2d(pixelx, pixely);
+    return df::coord2d(gps->mouse_x_pixel, gps->mouse_y_pixel);
 }
 
 df::coord2d Screen::getWindowSize()
@@ -120,18 +114,22 @@ static bool doSetTile_default(const Pen &pen, int x, int y, bool map)
     if (x < 0 || x >= dim.x || y < 0 || y >= dim.y)
         return false;
 
-/* TODO: understand how this changes for v50
+// TODO: understand how this changes for v50
     int index = ((x * gps->dimy) + y);
-    auto screen = gps->screen + index*4;
-    screen[0] = uint8_t(pen.ch);
-    screen[1] = uint8_t(pen.fg) & 15;
-    screen[2] = uint8_t(pen.bg) & 15;
-    screen[3] = uint8_t(pen.bold) & 1;
-    gps->screentexpos[index] = pen.tile;
-    gps->screentexpos_addcolor[index] = (pen.tile_mode == Screen::Pen::CharColor);
-    gps->screentexpos_grayscale[index] = (pen.tile_mode == Screen::Pen::TileColor);
-    gps->screentexpos_cf[index] = pen.tile_fg;
-    gps->screentexpos_cbr[index] = pen.tile_bg;
+    gps->screen1_opt_tile[index] = uint8_t(pen.ch);
+    // we need a new way to represent color
+    //auto argb = &gps->screen1_asciirgb[index * 8];
+/* old code
+//     auto screen = gps->screen + index*4;
+//     screen[0] = uint8_t(pen.ch);
+//     screen[1] = uint8_t(pen.fg) & 15;
+//     screen[2] = uint8_t(pen.bg) & 15;
+//     screen[3] = uint8_t(pen.bold) & 1;
+//     gps->screentexpos[index] = pen.tile;
+//     gps->screentexpos_addcolor[index] = (pen.tile_mode == Screen::Pen::CharColor);
+//     gps->screentexpos_grayscale[index] = (pen.tile_mode == Screen::Pen::TileColor);
+//     gps->screentexpos_cf[index] = pen.tile_fg;
+//     gps->screentexpos_cbr[index] = pen.tile_bg;
 */
     return true;
 }