Adobe Flash player and Citrix (WTS)

Install Flash Player as ActiveX with "change user /install" mode, edit permissions on the keys (below) and deleted IE application and published it again:

HKEY_CLASSES_ROOT\CLSID\{D27CDB6E-AE6D-11cf-96B8-444553540000}

HKEY_CLASSES_ROOT\CLSID\{D27CDB70-AE6D-11cf-96B8-444553540000}

1. Right-click the key, select "Permissions"
2. In the Permissions Dialog click the "Advanced" button
3. Click "Add"
4. Enter "Everyone" and click "OK" to accept
5. Select "Allow" for the "Query Value", "Enumerate Subkeys", "Notify" and "Read Control" permissions.