If you're rolling out App-V 4.5 and noticing that some clients aren't getting the apps and icons they should then you might want to check the SFTLOG.TXT for 00001007 errors:
Issue: On Microsoft Application Virtualization 4.5 clients, short-cuts for a particular application may not be available to users that have been granted access to the application and the following items may be logged in the SFTLOG.TXT file:
The app manager could not create an application from
'\\AppvServer\content\<folderName>\<appName>.osd' (rc 0C404844-00001007).
Cause: This can occur if the application has not been approved for the specific operating system running on the client. For example, the application was approved for Windows Vista clients but not Windows 2003 Terminal Server clients.
Resolution: To resolve this issue, check the OSD file for the application to determine if the client's operating system is
listed. Some examples of these OS tags are below:
Windows XP = <OS VALUE="WinXP"/>
Windows Vista = <OS VALUE="WinVista"/>
Windows Server 2003 TS = <OS VALUE="Win2003TS"/>
Windows Server 2008 TS = <OS VALUE="Win2008TS"/>
More info: SoftGrid Operations Guide - Part 1 (section 2.4.1)