diff --git a/lib/Slic3r.pm b/lib/Slic3r.pm
index 9d987397f..0c6c81bb5 100644
--- a/lib/Slic3r.pm
+++ b/lib/Slic3r.pm
@@ -161,8 +161,12 @@ sub thread_cleanup {
     *Slic3r::Print::SupportMaterial2::DESTROY = sub {};
     *Slic3r::TriangleMesh::DESTROY          = sub {};
     *Slic3r::GUI::AppConfig::DESTROY        = sub {};
+    *Slic3r::GUI::GCodePreviewData::DESTROY = sub {};
     *Slic3r::GUI::PresetBundle::DESTROY     = sub {};
     *Slic3r::GUI::Tab::DESTROY              = sub {};
+    *Slic3r::GUI::PresetHints::DESTROY      = sub {};
+    *Slic3r::GUI::TabIface::DESTROY         = sub {};
+    *Slic3r::OctoPrint::DESTROY             = sub {};
     *Slic3r::PresetUpdater::DESTROY         = sub {};
     return undef;  # this prevents a "Scalars leaked" warning
 }
diff --git a/xs/src/slic3r/GUI/Tab.cpp b/xs/src/slic3r/GUI/Tab.cpp
index 009509282..5e9b249ef 100644
--- a/xs/src/slic3r/GUI/Tab.cpp
+++ b/xs/src/slic3r/GUI/Tab.cpp
@@ -1004,29 +1004,6 @@ void TabPrint::update()
 		on_value_change("fill_density", fill_density);
 	}
 
-	auto first_layer_height = m_config->option<ConfigOptionFloatOrPercent>("first_layer_height")->value;
-	auto layer_height = m_config->opt_float("layer_height");
-	if (m_config->opt_bool("wipe_tower") &&
-		(first_layer_height != 0.2 || layer_height < 0.15 || layer_height > 0.35)) {
-		wxString msg_text = _(L("The Wipe Tower currently supports only:\n"
-			"- first layer height 0.2mm\n"
-			"- layer height from 0.15mm to 0.35mm\n"
-			"\nShall I adjust those settings in order to enable the Wipe Tower?"));
-		auto dialog = new wxMessageDialog(parent(), msg_text, _(L("Wipe Tower")), wxICON_WARNING | wxYES | wxNO);
-		DynamicPrintConfig new_conf = *m_config;
-		if (dialog->ShowModal() == wxID_YES) {
-			const auto &val = *m_config->option<ConfigOptionFloatOrPercent>("first_layer_height");
-			auto percent = val.percent;
-			new_conf.set_key_value("first_layer_height", new ConfigOptionFloatOrPercent(0.2, percent));
-
-			if (m_config->opt_float("layer_height") < 0.15) new_conf.set_key_value("layer_height", new ConfigOptionFloat(0.15));
-			if (m_config->opt_float("layer_height") > 0.35) new_conf.set_key_value("layer_height", new ConfigOptionFloat(0.35));
-		}
-		else
-			new_conf.set_key_value("wipe_tower", new ConfigOptionBool(false));
-		load_config(new_conf);
-	}
-
 	if (m_config->opt_bool("wipe_tower") && m_config->opt_bool("support_material") &&
 		m_config->opt_float("support_material_contact_distance") > 0. &&
 		(m_config->opt_int("support_material_extruder") != 0 || m_config->opt_int("support_material_interface_extruder") != 0)) {