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I have a problem with the conversion, all strokes will be converted, but the handwritten stroke will not disappear. This problem appears very spontaneously. I cannot explain, when or how it occurs. Here is a picture 

Hopefully you can see my mistake. 

Hello Oliver, 

thanks for your fast reply. I just checked the podfile.lock and it says I use the 1.4.1 version. Here is a screenshot of my podfile.lock. Is this correct ? 

Of course, here are the configurations: 

 if let appDelegate = UIApplication.shared.delegate as? AppDelegate {
            if (appDelegate.engine == nil)
            {
                let alert = UIAlertController(title: "Certificate error",
                                              message: appDelegate.engineErrorMessage,
                                              preferredStyle: UIAlertController.Style.alert)
                alert.addAction(UIAlertAction(title: "OK",
                                              style: UIAlertAction.Style.default,
                                              handler: {(action: UIAlertAction) -> Void in
                                                exit(1)
                }))
                self.present(alert, animated: true, completion: nil)
                return
            }
            
            editorViewController.engine = appDelegate.engine
           
            
            do {
             try editorViewController.engine.configuration.setBoolean(false, forKey: "math.solver.enable")
            } catch {
                print("math config was not succesfull")
            }
            
            do {
             try editorViewController.engine.configuration.setBoolean(true, forKey: "math.eraser.show")
            } catch {
                print("math config was not succesfull")
            }

        }

 func createPackage(packageName: String) throws -> IINKContentPackage? {
        // Create a new content package with name
        var resultPackage: IINKContentPackage?
        
        let fullPath = FileManager.default.pathForFile(inDocumentDirectory: packageName) + ".iink"
        if let engine = (UIApplication.shared.delegate as? AppDelegate)?.engine {
            resultPackage = try engine.createPackage(fullPath.decomposedStringWithCanonicalMapping)
            // Add a blank page type Text Document
            if let part = try resultPackage?.createPart("Math") /* Options are : "Diagram", "Drawing", "Math", "Raw Content", "Text Document", "Text" */ {
                self.title = "Type: " + part.type

            }
        }
        return resultPackage
    }

And here is the timer: 

 private var timer: Timer?
    private var convertRequired: Bool = false
    private var countDown: Double = 1.5
    var latexString: String?
    private var packageName = "Next"

    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        if let touchFirst = touches.first {
            if touchFirst.location(in: editorViewController.view).y > 0 {
                containerView.writeHereLabel.isHidden = true
                if let time = timer {
                    time.invalidate()
                    timer = nil
                }
                convertRequired = true
            }
        }
    }

    override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
        if let touchFirst = touches.first {
            if touchFirst.location(in: editorViewController.view).y > 0 {

                timer = Timer.scheduledTimer(withTimeInterval: 0.5, repeats: true) { timer in
                    self.countDown -= 0.5
                    if self.countDown == 0 && self.convertRequired == true  {
                        self.convertButtonWasTouched(nil)
                        self.countDown = 1.5
                        self.convertRequired = false
                        timer.invalidate()
                    }
                }
            }
        }
    }

 But this problem sometimes appears even if I convert manually by tapping a button and not using a timer. 

Update: It seems this error only appears if the View in which the EditorViewController is embedded is draggable, i.e. if the height constraint is adjustable. So I put the editorViewController in a container view with fixed constraints. I tried for about 30 minutes and I was not able to reproduce this error. I do not know why but it this error shows up if the height is adjustable. 

Thanks! 

Hello Olivier, 

I did not enable math.convert.animate configuration to yes. This problem only appears, as explained above, when the height constraint of the editorViewController was adjustable.

Best regards, 

Thanh