When using the Dataminer cube application I am unable to sign out and switch to a different DMA that I have saved in the app. I need to fully quit the app and re-launch in order to have the option to select a different DMA to log in to. The attached screenshot shows the screen I see after logging out and attempting to login to a different DMA but I cannot click anything. 
Hi Joseph,
Please could you confirm the DMA version that you are running?
Since DMA version 10.1.3 there is a back button available to go to the start window:
Hi Joseph, if upgrading to the version Miguel mentioned is not possible for you, you could pin the DataMiner Cube application to your taskbar. It's not the same as going back, but it's faster to re-open it from the taskbar compared to from the notification area or start menu.
We just upgraded our DMS to 10.1.0.0-10368-CU3 so i guess we are right behind the version we need for that fix.