I have not experienced any such problem when I clicked Thank You button on one of the posts a minute before.  

You have to say thank you from the heart!!!!and then click the Thank you button.

I am not that bad, I always say thank you from my heart. Well, jokes apart, but, do you have any solution? 

If you are not able to get the desired result, then clear your browser's cache and try again.

My " Thank you " button " functioning well. Had i faced such situation i would have shown a solution. Moderator Sunil has seen this thread. Hope you  definitely get a solution

If you are not able to get the desired result, then clear your browser's cache and try again.

If still you are not able to get thru then in the post of the member you want to say thank you press quote button and type thank you and submit.

If you can click on like you have been doing before, that should suffice because thank you and like is almost the same here , at least I am not able to distinguish it so I just click one of them ! the message would be the same ..

If one looks at profile. one see if your like and Thank you are recorded or not

server problem or if you are using chrome browser then goto setting - advanced setting -content setting - there you look after javascript and check it. Restart your browser i hope this will work for you