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« on: 2016-11-01, 13:15:13 »
Hi,
to completely uninstall Corona (on Windows) you should use uninstall option in Programs and features or run uninstaller directly (by default it should be located in C:\Program Files\Corona\). This should remove all versions of C4D plugin installed and also all registry and files located outside C4D folder as long as there is no Max version installed - if there is, it will leave some files and registry records used by Corona for 3ds Max. Plugin for C4D does not use anything that could be left for 3ds max, so uninstalling C4D part should be enough for clean install. Apart from that, it is always good to install Windows updates as I've already seen some similar issues when using non-updated system (although everything required by plugin should be already installed by installer).
As of problem with materials, I know there are some issues that can slow down update of material preview but I couldn't reproduce anything so bad, ie it can take few seconds to update but shouldn't take so long nor freeze C4D while rendering preview. We will try to do something about this in A6 RC2...