Search_replace, write and read corrupting files

Bug Reports
1

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

sometimes when i ask claude to edit files and this is also on auto mode. its corrupting files when i try to edit files with claude. i have git so can restore but its a serious issue

Steps to Reproduce

use claude and auto on a file and eventually it should happen

Operating System

Windows 10/11

Current Cursor Version (Menu → About Cursor → Copy)

Version: 1.7.40 (user setup)
VSCode Version: 1.99.3
Commit: df79b2380cd32922cad03529b0dc0c946c311850
Date: 2025-10-09T02:55:11.735Z
Electron: 34.5.8
Chromium: 132.0.6834.210
Node.js: 20.19.1
V8: 13.2.152.41-electron.0
OS: Windows_NT x64 10.0.19045

Does this stop you from using Cursor

Sometimes - I can sometimes use Cursor

2

Hey, thanks for the report. To narrow it down, could you share:

  • What does the “corruption” look like? (e.g., partial deletions, garbled text, duplicated blocks, wrong line endings)
  • Which files are affected (types, sizes, specific sections)?
  • Does it happen more on large files or during rapid, multiple edits?
  • Does it occur in a brand‑new chat or only in an existing large chat?
  • Which file types/extensions are impacted?
  • Any correlation with network issues or system performance drops?
  • What file encoding is used (UTF‑8, UTF‑16, with/without BOM)?

In the meantime, please try:

  • Using other models (e.g., Grok, GPT‑5) in a new chat
  • Testing different encodings
  • Capturing before/after diffs, plus logs and timestamps

Could you also share a Request ID with privacy mode disabled? Getting a Request ID | Cursor Docs

The team is already investigating related Windows file‑editing issues, so these details will help confirm the root cause and prioritize a fix.

3

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