For every single instance application there is a lock file created (/tmp/single-instance-locks/<application>/instance.lock if I remember correctly). I guess this lock persists when killing your application, which prevents single-instance from launching another instance.

Ok but so is a problem of the system that doesn’t clear the lock…?

If i close my app with my close button, it always work; when i kill the app in the task manager it always doesn’t restart!!!
The lock file is always present in both case (closing the app)

I think single-instance should release the lock even when the application gets terminated.

However, I am too little involved in Meego development to know why single-instance behaves this way or if this is a known limitation / bug. Probably the Meego forums or the Meego mailing list are better places to discuss this question.

Ok, but for that reason, ovi publisher has unpublished my app!

You should look from the page below how to do single instance apps in Harmattan (it’s very badly documented by Nokia…)

http://developer.qt.nokia.com/wiki/Single_Instance_Harmattan_Applications