diff --git a/qtapputils/managers/capture.py b/qtapputils/managers/capture.py
index 3455736..26cfb8f 100644
--- a/qtapputils/managers/capture.py
+++ b/qtapputils/managers/capture.py
@@ -41,13 +41,23 @@ class StandardStreamEmitter(QObject):
     """
     sig_new_text = Signal(str)
 
+    def __init__(self, stream='stdout'):
+        super().__init__()
+        self._stream = sys.__stderr__ if stream == 'stderr' else sys.__stdout__
+
     def write(self, text):
         try:
-            sys.__stdout__.write(text)
+            self._stream.write(text)
         except Exception:
             pass
         self.sig_new_text.emit(str(text))
 
+    def flush(self):
+        try:
+            self._stream.flush()
+        except Exception:
+            pass
+
 
 class SysCaptureManager(QObject):
     """
@@ -76,10 +86,10 @@ def __init__(self, start_capture=False):
         self.except_hook.sig_except_caught.connect(self._handle_except)
 
         # Setup the standard stream emitter.
-        self.stdout_emitter = StandardStreamEmitter()
+        self.stdout_emitter = StandardStreamEmitter('stdout')
         self.stdout_emitter.sig_new_text.connect(self.__handle_stdout)
 
-        self.stderr_emitter = StandardStreamEmitter()
+        self.stderr_emitter = StandardStreamEmitter('stderr')
         self.stderr_emitter.sig_new_text.connect(self.handle_stderr)
 
         if start_capture:
diff --git a/qtapputils/widgets/exceptions.py b/qtapputils/widgets/exceptions.py
index a78bf6a..ef2db1c 100644
--- a/qtapputils/widgets/exceptions.py
+++ b/qtapputils/widgets/exceptions.py
@@ -7,29 +7,24 @@
 # Licensed under the terms of the GNU General Public License.
 # -----------------------------------------------------------------------------
 from __future__ import annotations
-from typing import TYPE_CHECKING, Callable
 
 # ---- Standard library imports
 import os
-import os.path as osp
 import sys
 import datetime
 import tempfile
+from pathlib import Path
 
 
 # ---- Third party imports
 from qtapputils.icons import get_standard_icon, get_standard_iconsize
-from qtpy.QtCore import Qt
-from qtpy.QtGui import QIcon
+from qtpy.QtCore import Qt, QUrl
+from qtpy.QtGui import QIcon, QDesktopServices
 from qtpy.QtWidgets import (
     QApplication, QDialog, QDialogButtonBox, QGridLayout, QLabel, QPushButton,
     QTextEdit, QWidget)
 
 
-# ---- Local imports
-from hydrogeolab.config.main import TEMP_DIR
-
-
 class ExceptDialog(QDialog):
     """
     A dialog to report internal errors encountered by the application during
@@ -38,7 +33,8 @@ class ExceptDialog(QDialog):
 
     def __init__(self, appname: str, appver: str, system_info: str = None,
                  icon: QIcon = None, issue_tracker: str = None,
-                 issue_email: str = None, parent: QWidget = None):
+                 issue_email: str = None, parent: QWidget = None,
+                 temp_dir: str | Path = None):
         super().__init__(parent)
         self.setWindowTitle(f"{appname} Internal Error")
         self.setWindowFlags(
@@ -46,6 +42,15 @@ def __init__(self, appname: str, appver: str, system_info: str = None,
         if icon is not None:
             self.setWindowIcon(icon)
 
+        self.temp_dir = None
+        if temp_dir is not None:
+            temp_dir = Path(temp_dir)
+            if temp_dir.is_dir() and os.access(temp_dir, os.W_OK):
+                self.temp_dir = temp_dir
+            else:
+                print(f"Provided temp_dir {temp_dir} is not a valid or "
+                      "writable directory. Falling back to system default.")
+
         self.log_msg = None
         self.detailed_log = None
 
@@ -176,11 +181,14 @@ def show_detailed_log(self):
         chosen by the OS.
         """
         name = '{}Log_{}.txt'.format(self.appname, self.log_datetime)
-        temp_path = tempfile.mkdtemp(dir=TEMP_DIR)
-        temp_filename = osp.join(temp_path, name)
-        with open(temp_filename, 'w') as txtfile:
+
+        temp_path = Path(tempfile.mkdtemp(dir=self.temp_dir))
+        temp_filename = temp_path / name
+        with open(temp_filename, 'w', encoding='utf-8') as txtfile:
             txtfile.write(self.detailed_log)
-        os.startfile(temp_filename)
+
+        # Cross-platform file opening (Windows, macOS, Linux) via Qt
+        QDesktopServices.openUrl(QUrl.fromLocalFile(str(temp_filename)))
 
     def copy(self):
         """