diff --git a/gui/log_viewer.py b/gui/log_viewer.py
index 9b487af..5deca3d 100644
--- a/gui/log_viewer.py
+++ b/gui/log_viewer.py
@@ -6,7 +6,7 @@ from PyQt5.QtWidgets import (
     QWidget, QVBoxLayout, QTextEdit, QLabel, QSizePolicy
 )
 from PyQt5.QtCore import Qt, pyqtSignal, QTimer
-from PyQt5.QtGui import QTextCursor, QFont
+from PyQt5.QtGui import QTextCursor, QFont, QTextCharFormat
 from pathlib import Path
 import datetime
 import html
@@ -120,6 +120,9 @@ class LogViewer(QWidget):
     def clear_log(self):
         """Clear the log display and reset tracking."""
         self.log_display.clear()
+        # Reset the char format so the red color from previous [MISMATCH]
+        # HTML spans doesn't bleed into new plain-text appends.
+        self.log_display.setCurrentCharFormat(QTextCharFormat())
         self.status_label.setText("Log cleared")
         # Reset tail file pointer and buffer if active
         self._tail_buffer = ""
@@ -171,11 +174,26 @@ class LogViewer(QWidget):
         self._tail_timer.start(self._tail_interval)
 
     def stop_tail(self):
-        """Stop tailing the log file and close internal file handle."""
+        """Stop tailing the log file and close internal file handle.
+
+        Performs a final drain so no data written before this call is lost.
+        """
         try:
             self._tail_timer.stop()
         except Exception:
             pass
+        # Final drain: read any remaining data before closing the handle
+        try:
+            self._poll_tail()
+        except Exception:
+            pass
+        # Flush any leftover partial line sitting in the buffer
+        if self._tail_buffer and self._tail_buffer.strip():
+            try:
+                self.append_log_message(self._tail_buffer)
+            except Exception:
+                pass
+            self._tail_buffer = ""
         if self._tail_f:
             try:
                 self._tail_f.close()
@@ -235,12 +253,13 @@ class LogViewer(QWidget):
         if "[MISMATCH]" in message:
             escaped = html.escape(message)
             self.log_display.append(f'<span style="color: #ff4444;">{escaped}</span>')
-            # Emit signal on the header line ("Failed after retries") so the
-            # counter increments once per mismatch event, not per line.
-            if "Failed after retries" in message:
-                self.mismatch_detected.emit()
+            # Counting is handled via stdout MISMATCH_EVENT markers in
+            # TranslationTab.append_log — the log viewer only handles display.
         else:
-            self.log_display.append(message)
+            # Explicitly wrap in a white span so Qt doesn't inherit red from
+            # a preceding [MISMATCH] HTML append.
+            escaped = html.escape(message)
+            self.log_display.append(f'<span style="color: #ffffff;">{escaped}</span>')
 
         # Scroll to bottom
         cursor = self.log_display.textCursor()
diff --git a/gui/translation_tab.py b/gui/translation_tab.py
index 4d2980a..f7504c0 100644
--- a/gui/translation_tab.py
+++ b/gui/translation_tab.py
@@ -814,8 +814,8 @@ class TranslationTab(QWidget):
         self.reset_view_button.setStyleSheet(icon_btn_style)
         self.open_translations_button.setStyleSheet(icon_btn_style)
         # Ensure emoji/icons are readable
-        self.reset_view_button.setFont(QFont('', 12))
-        self.open_translations_button.setFont(QFont('', 12))
+        self.reset_view_button.setFont(QFont('Segoe UI', 12))
+        self.open_translations_button.setFont(QFont('Segoe UI', 12))
 
         # Create the stop button here so it sits in the same row as the
         # back/open buttons. Use a compact icon style to match them but
@@ -849,7 +849,7 @@ class TranslationTab(QWidget):
         self.stop_button.clicked.connect(self.stop_translation)
         self.stop_button.setStyleSheet(stop_button_style)
         # Slightly larger font for the emoji to make it visually clear
-        self.stop_button.setFont(QFont('', 14))
+        self.stop_button.setFont(QFont('Segoe UI', 14))
         self.stop_button.setVisible(False)
 
         # Place both buttons on the left and totals on the right
@@ -1017,6 +1017,9 @@ class TranslationTab(QWidget):
         
         # Right side - translation history log viewer
         self.translation_log_viewer = LogViewer()
+        # Mismatch counting is driven by MISMATCH_EVENT stdout markers
+        # detected in append_log. The log_viewer signal is kept as a
+        # fallback for in-process mode (e.g. speaker-parse).
         self.translation_log_viewer.mismatch_detected.connect(self.on_mismatch_detected)
 
         # Allow both left and right widgets to expand vertically so the
@@ -1743,6 +1746,11 @@ class TranslationTab(QWidget):
             self.translation_worker.start()
             
     def append_log(self, message):
+        # Detect mismatch markers emitted to stdout by translation.py.
+        # This is the primary, non-racy detection path for subprocess mode.
+        if isinstance(message, str) and message.startswith("MISMATCH_EVENT:"):
+            self.on_mismatch_detected()
+            return  # marker is internal, not displayed
         try:
             pattern = r'^\W*(?P<filename>[^:]+):.*?\[Input:\s*(?P<input>\d+)\].*?\[Output:\s*(?P<output>\d+)\].*?\[Cost:\s*\$(?P<cost>[\d\.]+)\].*?\[(?P<time>[\d\.]+)s\]'
             m = re.search(pattern, message)
@@ -1941,10 +1949,11 @@ class TranslationTab(QWidget):
         except Exception:
             pass
 
-        # Stop tailing the log when finished
+        # Stop tailing the log after a short delay so the final poll
+        # can pick up any data written just before the worker finished.
         try:
             if hasattr(self, 'translation_log_viewer') and self.translation_log_viewer:
-                self.translation_log_viewer.stop_tail()
+                QTimer.singleShot(600, self.translation_log_viewer.stop_tail)
         except Exception:
             pass
             
diff --git a/util/translation.py b/util/translation.py
index 58fbe57..1d17db7 100644
--- a/util/translation.py
+++ b/util/translation.py
@@ -1263,7 +1263,15 @@ def translateAI(text, history, fullPromptFlag, config, filename=None, pbar=None,
 
         else: # Failure case after all retries
             if pbar: pbar.write(f"Translation failed after {max_retries + 1} attempts. Check mismatch log.")
-            
+
+            # Emit a machine-readable marker on stdout so the GUI worker
+            # thread can detect the mismatch reliably (stdout is captured
+            # synchronously, unlike file-tail polling which can be racy).
+            try:
+                print(f"MISMATCH_EVENT:{filename}", flush=True)
+            except Exception:
+                pass
+
             formatted_mismatch_output = last_raw_translation
             try:
                 parsed_json = json.loads(last_raw_translation)