Sorry about the inconvenience. The Enable Templates Code Completion option actually enables the custom JustCode code complete (intellisense) in the templates. What you could do to avoid the annoyances is set your CodeTemplates -> General -> Acronym Expansion Hotkey setting to Shift + Space. That would prevent templates exapnsion while typing as usual and you could resume your normal workflow while still having the chance to use the templates.
It seems you have installed a succession of our internal builds. While we are doing our best to have these stable and coherent it does not always work out that way. We had the Acronym Expansion Hotkey set to default value of Space in one of these builds. We realized it might be a problem and we set it to Shift+Space in the next ones. However, since these are internal builds there was no proper merge between the settings files implemented. Hence, the users that installed that first internal build remained with the default setting of Space which causes all that trouble.
Once again I beg your pardon about it.
the Telerik team
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