Virtual app YouDaoNote is surrounded by a black border.

 

1.Add 'YoudaoAccompanyWnd' key on VDA below registry
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Citrix\wfshell\TWI
Key: YoudaoAccompanyWnd

2.Under YoudaoAccompanyWnd create two below values
Name: ClassName
Type:REG_SZ
Value:YoudaoAccompanyWnd

Name:Type
Type:REG_DWORD
Value:1000 (Hex)



Other same issue app registry:

WeChat:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Citrix\wfshell\TWI\popupshadow

Name: ClassName
Type:REG_SZ
Value:popupshadow

Name:Type
Type:REG_DWORD
Value:1000 (Hex)

YoudaoDict: 
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Citrix\wfshell\TWI\YNoteShadowWnd

Name: ClassName
Type:REG_SZ
Value:YNoteShadowWnd

Name:Type
Type:REG_DWORD
Value:1000 (Hex)


DingTalk: 

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Citrix\wfshell\TWI\DuiShadowWnd

Name: ClassName
Type:REG_SZ
Value:DuiShadowWnd

Name:Type
Type:REG_DWORD
Value:1000 (Hex)
 

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Problem Cause

In YouDaoNote user login GUI, there is a  WS_EX_transparent styled window with  ClassName=YoudaoAccompanyWnd. So the window is invisible in a physical machine. In XenApp seamless session, when Citrix seamless engine creating such a  WS_EX_transparent styled window at client side, the default behavior is to fill the window with background image, like Windows desktop wallpaper, rather than display it as transparent effect.