Unable to launch Dynamo

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Hi. I have a problem when I want to start Dynamo form Revit. I have installed the latest Dynamo Build. When I click the dynamo add-in icon , Dynamo starts in background and it remains there. It is impossible to make that window active. Has this happened to anyone of you? There is any tip and trick to use? Thanks.![Dynamo Start|300x208](upload://uMJk8EhhvaTh3XhOcNdJKHTfqL1.png)
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