diff --git a/WinSyncScroll/ViewModels/MainViewModel.cs b/WinSyncScroll/ViewModels/MainViewModel.cs
index 63fcc9d..78f0180 100644
--- a/WinSyncScroll/ViewModels/MainViewModel.cs
+++ b/WinSyncScroll/ViewModels/MainViewModel.cs
@@ -343,7 +343,20 @@ private async Task RunMouseEventProcessingLoopAsync(
                     if (!_options.Value.IsLegacyModeEnabled)
                     {
                         LogSendInput(inputs);
-                        PInvoke.SendInput(inputs.AsSpan(), SizeOfInput);
+                        var sentCount = PInvoke.SendInput(inputs.AsSpan(), SizeOfInput);
+                        
+                        if (sentCount != inputs.Length)
+                        {
+                            var lastError = Marshal.GetLastWin32Error();
+                            _logger.LogError("SendInput failed: expected to send {ExpectedCount} events, but only {SentCount} were sent. Last Win32 error: {LastError}",
+                                inputs.Length,
+                                sentCount,
+                                lastError);
+                        }
+                        else
+                        {
+                            _logger.LogTrace("Successfully sent {SentCount} input events", sentCount);
+                        }
                     }
                     else
                     {
@@ -369,7 +382,20 @@ private async Task RunMouseEventProcessingLoopAsync(
                                 lParam,
                                 targetX,
                                 targetY);
-                            PInvoke.PostMessage(windowHandle, (uint)buffer.MouseMessageId, (nuint)buffer.MouseMessageData.mouseData, lParam);
+                            
+                            var result = PInvoke.PostMessage(windowHandle, (uint)buffer.MouseMessageId, (nuint)buffer.MouseMessageData.mouseData, lParam);
+                            
+                            if (!result)
+                            {
+                                var lastError = Marshal.GetLastWin32Error();
+                                _logger.LogError("PostMessage failed for window {WindowHandle}: Last Win32 error: {LastError}",
+                                    windowHandle,
+                                    lastError);
+                            }
+                            else
+                            {
+                                _logger.LogTrace("Successfully posted message to window {WindowHandle}", windowHandle);
+                            }
                         }
                     }
                 }