Simulation doesn stop in ADS 2017 update 1

Hello,

i have a problem with the programm ADS 2017 Update 1 version. Everytime i simulate a schematic the first time it works just great, but when i change something in the schematic and want to simulate it again it says that a simulation is still running and i have to stop it before i can simulate the "new" schematic. So i tried to stop the first simulation but it doesnt work. It just says "Simulation Abort in Progress - Please wait" but nothing happens after that. And if i want to simulate again i have to restart the whole programm.

Is there a setting I´m missing or so?

Hope you can help me.

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