diff --git a/V2rayU/Import.swift b/V2rayU/Import.swift
index 5dc311a..fd96ff9 100644
--- a/V2rayU/Import.swift
+++ b/V2rayU/Import.swift
@@ -296,6 +296,16 @@ class ImportUri {
     }
 
     func importVless(vmess: VlessUri) {
+        if vmess.fp.isEmpty {
+            vmess.fp = "chrome"
+        }
+        if vmess.security.isEmpty {
+            vmess.security = "none"
+        }
+        if vmess.flow.isEmpty {
+            vmess.flow = "xtls-rprx-vision"
+        }
+        
         let v2ray = V2rayConfig()
         v2ray.serverProtocol = V2rayProtocolOutbound.vless.rawValue
 
@@ -398,7 +408,6 @@ class ImportUri {
         svr.address = trojan.host
         svr.port = trojan.port
         svr.password = trojan.password
-        svr.flow = trojan.flow
 
         v2ray.serverTrojan = svr
         v2ray.enableMux = false
@@ -492,7 +501,7 @@ func importByClash(clash: clashProxy) -> ImportUri? {
         item.address = clash.server
         item.port = clash.port
         item.id = clash.uuid ?? ""
-        item.security = clash.cipher ?? "auto"
+        item.security = clash.cipher ?? "none" // vless encryption
         item.type = clash.network ?? "tcp"
         item.sni = clash.sni ?? clash.server
         if clash.security == "reality" {
diff --git a/V2rayU/Preference/PreferencePac.swift b/V2rayU/Preference/PreferencePac.swift
index e5d4817..6abc55b 100644
--- a/V2rayU/Preference/PreferencePac.swift
+++ b/V2rayU/Preference/PreferencePac.swift
@@ -109,14 +109,17 @@ final class PreferencePacViewController: NSViewController, PreferencePane {
         let session = URLSession(configuration: getProxyUrlSessionConfigure())
         let task = session.dataTask(with: URLRequest(url: reqUrl)){(data: Data?, response: URLResponse?, error: Error?) in
             if error != nil {
-                self.tips.stringValue = "Failed to download latest GFW List: \(String(describing: error))"
+                DispatchQueue.main.async {
+                    self.tips.stringValue = "Failed to download latest GFW List: \(String(describing: error))"
+                }
             } else {
                 if data != nil {
                     if let outputStr = String(data: data!, encoding: String.Encoding.utf8) {
                         do {
                             try outputStr.write(toFile: GFWListFilePath, atomically: true, encoding: String.Encoding.utf8)
-                            
-                            self.tips.stringValue = "gfwList has been updated"
+                            DispatchQueue.main.async {
+                                self.tips.stringValue = "gfwList has been updated"
+                            }
                             NSLog("\(self.tips.stringValue)")
 
                             // save to UserDefaults
@@ -124,20 +127,28 @@ final class PreferencePacViewController: NSViewController, PreferencePane {
 
                             if GeneratePACFile(rewrite: true) {
                                 // Popup a user notification
-                                self.tips.stringValue = "PAC has been updated by latest GFW List."
+                                DispatchQueue.main.async {
+                                    self.tips.stringValue = "PAC has been updated by latest GFW List."
+                                }
                                 NSLog("\(self.tips.stringValue)")
                             }
                         } catch {
                             // Popup a user notification
-                            self.tips.stringValue = "Failed to Write latest GFW List."
+                            DispatchQueue.main.async {
+                                self.tips.stringValue = "Failed to Write latest GFW List."
+                            }
                             NSLog("\(self.tips.stringValue)")
                         }
                     } else {
-                        self.tips.stringValue = "Failed to download latest GFW List."
+                        DispatchQueue.main.async {
+                            self.tips.stringValue = "Failed to download latest GFW List."
+                        }
                     }
                 } else {
                     // Popup a user notification
-                    self.tips.stringValue = "Failed to download latest GFW List."
+                    DispatchQueue.main.async {
+                        self.tips.stringValue = "Failed to download latest GFW List."
+                    }
                     self.tryDownloadByShell(gfwPacListUrl: gfwPacListUrl)
                 }
             }
@@ -153,7 +164,9 @@ final class PreferencePacViewController: NSViewController, PreferencePane {
         NSLog("curl result: \(msg)")
         if GeneratePACFile(rewrite: true) {
             // Popup a user notification
-            self.tips.stringValue = "PAC has been updated by latest GFW List."
+            DispatchQueue.main.async {
+                self.tips.stringValue = "PAC has been updated by latest GFW List."
+            }
         }
     }
 }
@@ -256,6 +269,7 @@ func getPacUserRules() -> String {
     ||github.com
     ||chat.openai.com
     ||openai.com
+    ||chatgpt.com
     """
     do {
         let url = URL(fileURLWithPath: PACUserRuleFilePath)
diff --git a/V2rayU/v2ray/V2rayConfig.swift b/V2rayU/v2ray/V2rayConfig.swift
index 55c4692..ce09939 100644
--- a/V2rayU/v2ray/V2rayConfig.swift
+++ b/V2rayU/v2ray/V2rayConfig.swift
@@ -770,6 +770,12 @@ class V2rayConfig: NSObject {
                         user.id = val["id"].stringValue
                         user.flow = val["flow"].stringValue
                         user.encryption = val["encryption"].stringValue
+                        if user.flow.isEmpty {
+                            user.flow = "xtls-rprx-vision"
+                        }
+                        if user.encryption.isEmpty {
+                            user.encryption = "none"
+                        }
                         user.level = val["level"].intValue
                         users.append(user)
                     }