Let me explain that a bit better!
I've got a reasonably small infrastructure (350-odd systems) which I'm prepping for upgrade to EPO 4.0 since 3.6.1 is EOL. I've been diligently upgrading agents, clients (had a real mess of stuff, including (yuck) some old 7.0 VirusScan installations) and have now almost finished - settled on 18.104.22.1688, VS 8.5 patch 8 - with a few systems running 22.214.171.1240, VS 8.7 Patch 2/3. All looks good in preparation for upgrade - but have an odd issue. 95% of systems are reporting as having the correct agent version (CMA 3 patch 4 or MC Agent 4 patch 2/3) in a query (All AV Installations By Last Contact), but a few are showing up completely blank. I've tried uninstalling & reinstalling both the agent and VS but it hasn't made any difference - sure as eggs is eggs, as soon as I either reinstall manually or push from the server, then run an agent wakeup & collect full props, the system shows up with a blank agent version again.
Anyone have any ideas what might be causing this (and what to do about resolving it?)
Cheers, in advance
In case anyone else encounters this, I was able to resolve by logging on to the machines in question then getting the agent to send props from the CLI (cd to install directory then run cmdagent /P). A couple of them required a reboot after installation to check back in properly.