diff --git a/src/mainloop.cpp b/src/mainloop.cpp
index f2a4533..a44718f 100644
--- a/src/mainloop.cpp
+++ b/src/mainloop.cpp
@@ -2,17 +2,17 @@ internal
 b8 init_imgui(GLFWwindow* window) {
   IMGUI_CHECKVERSION();
   ImGui::CreateContext();
-  ImGuiIO& io = ImGui::GetIO(); (void) io;
+  ImGuiIO& io = ImGui::GetIO();
   io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;
   io.IniFilename = nullptr;
   io.LogFilename = nullptr;
 
   ImGui::StyleColorsDark();
 
-  ImGui_ImplGlfw_InitForOpenGL(window, true);
-  ImGui_ImplOpenGL3_Init("#version 330");
+  b8 ok = ImGui_ImplGlfw_InitForOpenGL(window, true);
+  ok = ok && ImGui_ImplOpenGL3_Init("#version 330");
 
-  return true;
+  return ok;
 }
 
 internal 
@@ -152,27 +152,26 @@ void run_main_loop(GLFWwindow *window, Arena *arena, App_State &app)
     ImGui_ImplGlfw_NewFrame();
     ImGui::NewFrame();
 
-    // Check if the inspected file changed
-    {
-      if (file_has_changed(app.inspected_file.inot)) {
-        u64 prev_size = app.inspected_file.size;
-        app.inspected_file.size = file_size(app.inspected_file.stream);
-        int fd = fileno(app.inspected_file.stream);
-        os_remap_file(fd, app.inspected_file.mem, prev_size, app.inspected_file.size);
-        // reset memory for loaded file data
-        arena_pop_to(app.fdata.arena, 0);
-        memset(&app.fdata.rndata, 0, sizeof(app.fdata.rndata));
-        memset(&app.fdata.tfile_data, 0, sizeof(app.fdata.tfile_data));
-        b8 success = get_tfile_data(app.fdata.arena, app.inspected_file, app.walk_tkeys_flags, app.ntpl_name, app.fdata.tfile_data);
-        if (success)
-          app.fdata.rndata = get_rntuple_data(app.fdata.arena, app.inspected_file, app.fdata.tfile_data, app.extended_info);
-        compute_tot_sections_size(app.fdata.tfile_data.sections);
-        init_viewer_title(app.viewer, app.fdata, app.inspected_file.name);
-      }
+    // Check if the inspected file changed: if it did, reload the data.
+    if (file_has_changed(app.inspected_file.inot)) {
+      u64 prev_size = app.inspected_file.size;
+      app.inspected_file.size = file_size(app.inspected_file.stream);
+      int fd = fileno(app.inspected_file.stream);
+      os_remap_file(fd, app.inspected_file.mem, prev_size, app.inspected_file.size);
+
+      // reset memory for loaded file data
+      arena_pop_to(app.fdata.arena, 0);
+      memset(&app.fdata.rndata, 0, sizeof(app.fdata.rndata));
+      memset(&app.fdata.tfile_data, 0, sizeof(app.fdata.tfile_data));
+      b8 success = get_tfile_data(app.fdata.arena, app.inspected_file, app.walk_tkeys_flags, app.ntpl_name, app.fdata.tfile_data);
+      if (success)
+        app.fdata.rndata = get_rntuple_data(app.fdata.arena, app.inspected_file, app.fdata.tfile_data, app.extended_info);
+      compute_tot_sections_size(app.fdata.tfile_data.sections);
+      init_viewer_title(app.viewer, app.fdata, app.inspected_file.name);
     }
 
     if ((app.user_input.key_state[KEY_ESC] & KEY_STATE_IS_DOWN) || glfwWindowShouldClose(window)) {
-      app.should_quit = true;
+      app.should_quit = true; // superfluous right now, but set it just in case.
       break;
     }