diff --git a/openless-all/app/src-tauri/src/windows_ime_ipc.rs b/openless-all/app/src-tauri/src/windows_ime_ipc.rs
index 3fe8b0c3..ac7d4c06 100644
--- a/openless-all/app/src-tauri/src/windows_ime_ipc.rs
+++ b/openless-all/app/src-tauri/src/windows_ime_ipc.rs
@@ -3,7 +3,9 @@ use std::time::Duration;
 use crate::windows_ime_protocol::ImeSubmitStatus;
 
 pub const IME_CLIENT_WAIT_TIMEOUT: Duration = Duration::from_millis(700);
-pub const IME_SUBMIT_TIMEOUT: Duration = Duration::from_millis(900);
+// Must exceed the IME DLL owner-thread commit timeout (3000 ms), otherwise Rust
+// can fall back while the DLL later commits and duplicates insertion.
+pub const IME_SUBMIT_TIMEOUT: Duration = Duration::from_millis(3800);
 const IME_PIPE_RETRY_INTERVAL: Duration = Duration::from_millis(25);
 
 const ERROR_FILE_NOT_FOUND: u32 = 2;
diff --git a/openless-all/app/src-tauri/src/windows_ime_profile.rs b/openless-all/app/src-tauri/src/windows_ime_profile.rs
index dfddde06..2b3444b7 100644
--- a/openless-all/app/src-tauri/src/windows_ime_profile.rs
+++ b/openless-all/app/src-tauri/src/windows_ime_profile.rs
@@ -192,8 +192,8 @@ mod windows_impl {
     use windows::Win32::UI::Input::KeyboardAndMouse::HKL;
     use windows::Win32::UI::TextServices::{
         CLSID_TF_InputProcessorProfiles, ITfInputProcessorProfileMgr, GUID_TFCAT_TIP_KEYBOARD,
-        TF_INPUTPROCESSORPROFILE, TF_IPPMF_FORPROCESS, TF_PROFILETYPE_INPUTPROCESSOR,
-        TF_PROFILETYPE_KEYBOARDLAYOUT,
+        TF_INPUTPROCESSORPROFILE, TF_IPPMF_DONTCARECURRENTINPUTLANGUAGE, TF_IPPMF_FORSESSION,
+        TF_PROFILETYPE_INPUTPROCESSOR, TF_PROFILETYPE_KEYBOARDLAYOUT,
     };
     use winreg::enums::{HKEY_CURRENT_USER, HKEY_LOCAL_MACHINE, KEY_READ, KEY_WOW64_64KEY};
     use winreg::RegKey;
@@ -201,6 +201,8 @@ mod windows_impl {
     const OPENLESS_COM_INPROC_KEY: &str =
         r"Software\Classes\CLSID\{6B9F3F4F-5EE7-42D6-9C61-9F80B03A5D7D}\InprocServer32";
     const OPENLESS_TSF_PROFILE_KEY: &str = r"Software\Microsoft\CTF\TIP\{6B9F3F4F-5EE7-42D6-9C61-9F80B03A5D7D}\LanguageProfile\0x00000804\{9B5F5E04-23F6-47DA-9A26-D221F6C3F02E}";
+    const PROFILE_ACTIVATION_FLAGS: u32 =
+        TF_IPPMF_FORSESSION | TF_IPPMF_DONTCARECURRENTINPUTLANGUAGE;
 
     struct ComApartment;
 
@@ -255,7 +257,7 @@ mod windows_impl {
                 &clsid,
                 &profile_guid,
                 null_hkl(),
-                TF_IPPMF_FORPROCESS,
+                PROFILE_ACTIVATION_FLAGS,
             )
         })
     }
@@ -274,7 +276,7 @@ mod windows_impl {
                         &clsid,
                         &profile_guid,
                         null_hkl(),
-                        TF_IPPMF_FORPROCESS,
+                        PROFILE_ACTIVATION_FLAGS,
                     )
                 })
             }
@@ -289,7 +291,7 @@ mod windows_impl {
                         &zero_guid,
                         &zero_guid,
                         hkl,
-                        TF_IPPMF_FORPROCESS,
+                        PROFILE_ACTIVATION_FLAGS,
                     )
                 })
             }