Why some times Answers are not shown after submit?

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Looks like cache invalidation is not working properly for you.

I am guessing that this might be because your cache is not set up correctly and you are using a multiprocess setup for the application.

In the newer version of askbot some chunks of HTML and data are stored in cache and actively invalidated when certain things happen to questions/answers etc. Therefore with the default per-process cache of type "locmem" page renderings by the sibling process instances may not be the same.

Try using redis cache or memcached.