... also - check the "PolicySync" log on the client(s) in question (usually in - "C:\ProgramData\LANDesk\Logs\" - if PolicySync is failing to pull the list of "stuff to display", then your problem might be around that, and not workspaces.
Articles like the following would then be potentially useful (given that it ran for you before, I'm not 100% sure, but trying to pre-empt things here):
Thanks everyone, I found that my service account for the COM+ account had been removed from domain admins ad group. Once I added it back everything started working again.... but I looking to remove this again so this account does not have domain level admin access.
Humm - yeah - that's quite a bit of overkill.
The COM+ objects "just" need a "regular" AD-user (/service account). All we do there is query AD / resolve users ... - something that you can do with minimal rights just by existing in AD.
We definitely don't need to be Domain Admins.