Is any one else having problems with the smiley icons?

Hi All

I'm using Firefox the latest version and when I'm replying to posts or PMs,Half the time I  am having to bring the smiley icon box up twice as it does not work the first time?

Do I have to insert them before a fullstop.:smileywink:.or can I do it after one.:smileytongue:

Well that just blew that theory!

Any ideas why its a hit and miss thing,or is there something else that I'm not doing?