Try to perform a JQL search longer than 2.000 characters on Chrome or Firefox. You won't be able to do so in these browser but it will work fine on IE.
When searching for an Issue with JQL advanced search there is a limitation of 2.000 characters on Google Chrome and Mozilla Firefox (IE works fine).
This can cause some problems in gadgets filters or in the search itself when trying to perform a search with a long JQL query (when not using IE.)
Remove the limitation from all the browsers.