Hello All , I am using Appian 7.6 + Hotfix A and while accessing the admin

Hello All ,
I am using Appian 7.6 + Hotfix A and while accessing the admin application through localhost:8080/.../admin URL for changing a logo which is not allowing for update the logo.
1. It shows windows popup and asks for credentials and if we enter Appian credentials images are visible if cancel Appian branding images are seen with cross mark
2. Not able to click on change link which gives below error
<-----------------------------Error in server.log ----------------------------------->
ERROR com.appiancorp.common.logging.GWTRemoteLoggingService - Swallowed an error with no error code. ResponseClass: class com.appiancorp.gwt.tempo.client.designer.EvaluateUiResponse

...

OriginalPostID-124046

OriginalPostID-124046

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