I have had an issue with K2 2.0 and also K2 2.1 when it comes to the Virtuemart Ajax Backend Admin Category Search Drop Down Menu. The category search ajax dropdown drops down when a search query beyond three characters is executed but it hangs and ultimately dies without rendering any results. This issue was not eliminated with the upgrade to K2 2.1 and has been tested under both K2 versions with various versions of Joomla and Virtuemart.

The only way to fix this is by removing K2 completely. It is not enough to simply disable the K2 plugins. You must remove the K2 component, modules and plugins. Then, the Virtuemart category ajax search query works again.

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Hi. This was caused because of the use of common class between Virtuemart and K2. The class is "Services_JSON". Now it has been fixed for the next release. Thanks for reporting this issue to us.

We're having this exact problem in K2 2.4.1 - any ideas why?!