Opening PPS files is crashing my app

[Annie0]

I have a flash interface that has links to PPS files. The interface also has an animation that loops continuously in the background. However, after opening PPS files and hitting escape to return to the interface, the animation is frozen and none of the links work (but button rollovers still work and the quit button still works). It's like the interface has frozen up.

Here is the code I'm using to open the files, which works fine.
----------------------------------------------------------------------
on (press) {
id = setInterval(
function()
{
clearInterval(id);
ssCore.Shell.invoke({path:'startdir://Powerpoint.pps', verb:'open', waitForWindow: true, topmost:true});
}
, 100
);
}
----------------------------------------------------------------

Also, it seems to be random, sometimes i can open 5 in a row before it freezes up, sometimes it's only 1 or 2. I'm on a Windows 7 64-bit machine.

Please help!!!

Thanks,
Anne