ogckml.dll missing

Now here's a weird one. I've just installed the latest CN EU 2015.30 NTU onto my PCs, one a desktop and one a laptop, both with Win7. Having checked all was working fine I then used Control Panel on my desktop to remove 2015.20, only to find Basecamp (4.4.2) refused to launch with a 'ogckml.dll' missing error. Uninstalling then re-installing Basecamp resolved the problem.

I then deleted the older map from my laptop, same error, same solution.

Surely this shouldn't be happening :confused: