diff --git a/src/slic3r/GUI/UpdateDialogs.cpp b/src/slic3r/GUI/UpdateDialogs.cpp
index a4f696fb8..0f72b3b35 100644
--- a/src/slic3r/GUI/UpdateDialogs.cpp
+++ b/src/slic3r/GUI/UpdateDialogs.cpp
@@ -39,8 +39,7 @@ MsgUpdateSlic3r::MsgUpdateSlic3r(const Semver &ver_current, const Semver &ver_on
 	ver_current(ver_current),
 	ver_online(ver_online)
 {
-	const auto version = Semver::parse(SLIC3R_VERSION);
-	const bool dev_version = version->prerelease() != nullptr || boost::algorithm::ends_with(SLIC3R_BUILD_ID, "UNKNOWN");
+	const bool dev_version = ver_online.prerelease() != nullptr;
 
 	auto *versions = new wxFlexGridSizer(2, 0, VERT_SPACING);
 	versions->Add(new wxStaticText(this, wxID_ANY, _(L("Current version:"))));
@@ -119,7 +118,7 @@ MsgUpdateConfig::MsgUpdateConfig(const std::vector<Update> &updates) :
 
 		versions->Add(flex);
 
-		if (! update.changelog_url.empty()) {
+		if (! update.changelog_url.empty() && update.version.prerelease() == nullptr) {
 			auto *line = new wxBoxSizer(wxHORIZONTAL);
 			auto changelog_url = (boost::format(update.changelog_url) % lang_code).str();
 			line->AddSpacer(3*VERT_SPACING);
diff --git a/xs/xsp/Print.xsp b/xs/xsp/Print.xsp
index b8662dcd8..f4c04577d 100644
--- a/xs/xsp/Print.xsp
+++ b/xs/xsp/Print.xsp
@@ -165,7 +165,7 @@ _constant()
             try {
                 THIS->process();
             } catch (std::exception& e) {
-                croak(e.what());
+                croak("%s\n", e.what());
             }
         %};
 
@@ -173,7 +173,7 @@ _constant()
             try {
                 THIS->export_gcode(path_template, nullptr);
             } catch (std::exception& e) {
-                croak(e.what());
+                croak("%s\n", e.what());
             }
         %};