Linked movieclip flickers like a strobe light on rollover

programming flash
1

The 5 movie clips called myMovieClip1-5 display on rollover as part of Flashloaded’s PhotoFlow AS2 version. Adding actionscript to any of the movie clips in order to have an on release get URL, results in flickering on rollover

Here is the AS that shows the MCs

var eventListener:Object = new Object ();
eventListener.onSelectPhoto = function (eventObject:Object) {
    oThis.link = eventObject.link;
};
eventListener.onLoadPhotosComplete = function (eventObject:Object) {
    photoflow.setSelection (0);
};
photoflow.addEventListener ("onSelectPhoto",eventListener);
photoflow.addEventListener ("onSelectPhoto",eventListener);
myBtn.onRollOver = function () {
    clearInterval (interval);
    oThis.attachMovie (oThis.link,"linkedMC",oThis.getNextHighestDepth ());
    oThis.linkedMC._x = 154;
    oThis.linkedMC._y = 138;
};
myBtn.onRollOut = function () {
    oThis.linkedMC.removeMovieClip ();
    interval = setInterval (flipImage, 1000);
};
interval = setInterval (flipImage, 2000);