Forum Created a search block but get security token was invalid
 

I have created a custom forum block using the below code i took from within. The search works using Firefox browser and returns results BUT when testing under IE and Chrome i get

Your submission could not be processed because a security token was invalid.

I know this is probably error on my part not being a coder as such and probably missed something.

In addition i would like if possible to add also Search in Forum(s) list from advance search to this block as an option but getting the below to work correctly is first priority.


Code:

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  Search Entire Posts
  Search Titles Only
  

Thank you