Have to restart Keil uVision4 after Debug session

I have a very strange problem.
After stopping the Debug session, cannot download code to flash memory anymore,
got error: "Flash Download failed - "Cortex-M4".

I have to restart Keil to be able to Download code to flash memory again.
It happens every time after Debug session. If I try to start Debug session again, Keil will crash.

It worked before,the problems started when I created new user on my windows pc and deleted old one. i have tried to reinstall Keil uVission4, but it didn't solve the problem.

Where could be the problem?

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