Bed texture fixes:

 . if vendor has only texture or model, still show it.
 . png texture can turn black on compression on soe hardware. A new preference (compress_png_texture) is now available to disable the optimisation that can cause that.
You have to relaunch the app to force the reload of the texture or: remove it, go to platter, then re-add it.

src/libslic3r/AppConfig.cpp

@@ -361,6 +361,9 @@ void AppConfig::set_defaults()
             set("check_blacklisted_library", "1");
 #endif // _WIN32
 
+        if (get("compress_png_texture").empty())
+            set("compress_png_texture", "1");
+
         // remove old 'use_legacy_opengl' parameter from this config, if present
         if (!get("use_legacy_opengl").empty())
             erase("", "use_legacy_opengl");

src/slic3r/GUI/3DBed.cpp

@@ -392,6 +392,10 @@ std::tuple<Bed3D::Type, std::string, std::string, bool> Bed3D::detect_type(const
                     std::string texture_filename = PresetUtils::system_printer_bed_texture(*curr);
                     if (!model_filename.empty() && !texture_filename.empty())
                         return { Type::System, model_filename, texture_filename, PresetUtils::system_printer_model(*curr)->bed_with_grid };
+                    else if(!model_filename.empty())
+                        return { Type::System, model_filename, {}, true };
+                    else if(!texture_filename.empty())
+                        return { Type::System, {}, texture_filename, PresetUtils::system_printer_model(*curr)->bed_with_grid};
                 }
             }
 
@@ -452,7 +456,7 @@ void Bed3D::render_texture(bool bottom, GLCanvas3D& canvas) const
         } 
         else if (boost::algorithm::iends_with(texture_absolute_filename, ".png")) {
             // generate a temporary lower resolution texture to show while no main texture levels have been compressed
-            if (temp_texture->get_id() == 0 || temp_texture->get_source() != texture_absolute_filename) {
+            if (wxGetApp().app_config->get("compress_png_texture") == "1" && (temp_texture->get_id() == 0 || temp_texture->get_source() != texture_absolute_filename)) {
                 if (!temp_texture->load_from_file(texture_absolute_filename, false, GLTexture::None, false)) {
                     render_default(bottom, false);
                     return;
@@ -461,7 +465,8 @@ void Bed3D::render_texture(bool bottom, GLCanvas3D& canvas) const
             }
 
             // starts generating the main texture, compression will run asynchronously
-            if (!texture->load_from_file(texture_absolute_filename, true, GLTexture::MultiThreaded, true)) {
+            if (!texture->load_from_file(texture_absolute_filename, true, 
+                wxGetApp().app_config->get("compress_png_texture") == "1" ? GLTexture::MultiThreaded : GLTexture::ECompressionType::None, true)) {
                 render_default(bottom, false);
                 return;
             }

src/slic3r/GUI/Preferences.cpp

@@ -480,6 +480,13 @@ void PreferencesDialog::build(size_t selected_tab)
 	m_optgroup_camera->append_single_option_line(option);
 #endif // _WIN32 || __APPLE__
 
+	def.label = L("Compress png textures");
+	def.type = coBool;
+	def.tooltip = L("If your custom texture (in png format) is displayed black, then disable this option to remove the problematic optimisation.");
+	def.set_default_value(new ConfigOptionBool{ app_config->get("compress_png_texture") == "1" });
+	option = Option(def, "compress_png_texture");
+	m_optgroup_camera->append_single_option_line(option);
+
 	activate_options_tab(m_optgroup_camera);
 
 	// Add "GUI" tab