mIRC problem

Each time i use mIRC, an annoying bleeping sound is constantly being made, and the layout looks as if my NNScript has been removed... no button at toolbar etc... i get the messages;

* Break: command halted
* Break: command halted (line 215, kte-dyn.mrc)
* Break: command halted (line 6626, nnscript.nns)

in the status window.

Any help to fix this would be appreciated...