Pre assign Speaker Issue on 1.5.1

Using the latest version of the rule system I tried to assign speaker option to indicate NPC dialogue but I couldn't get it to work somehow. I know how to input the characters name - using the radial tab and assign speaker. But when I dragged the text into the chat window it simply said GM: "xxxxxxxxxx" instead of the players name.

I was since advised to revert to 1.4.1 which has somewhat solved the problem but created another. Now although speakers are correctly assigned in the chat the speech bubble next to the chat frame has been replaced by a black square.

I have discussed this issue on the main fantasy grounds forum including pictures to illustrate here:

http://www.fantasygrounds.com/forums/showthread.php?22016-Pre-Assign-Speaker-not-working-for-me!

Kind Regards

Noely