So I was finally able to debug this using IE's developer tools.  It turned
out that somewhere, somehow bOverTip is getting stuck in the "true" state. 
When that happens, the  if (this.bOverTip || this.mouseIsDown) im mouseMove
will always evaluate to true and maptips will cease to work until the
application is reloaded entirely.  To work-around it, I changed:

if (this.bOverTip || this.mouseIsDown) {
return;
}

to

if (this.bOverTip || this.mouseIsDown) {                                
this.bOverTip = false;  
this.mouseIsDown = false;       
return;
}

Maybe this will help someone else.........




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