I have an application that has given me no problems for the last week... I boot it up this morning and all of a sudden I am getting unhandled exceptions that point to a memory leak of some sort... I have been trying to figure out why and fix it, but have come up empty handed.

Qt Code: 
  1. void WInterface::toggleCueingSize()
  2. {
  3.   QPushButton *clickedButton = qobject_cast<QPushButton *>(sender());
  4.   if (clickedButton != 0)
  5.   {
  6.     std::string compareString = clickedButton->objectName().toStdString();
  7.     if (compareString.compare("bannerSensorSelectButton")==0)
  8.     {
  9.       ui->wBannerSensorDisplay->show();
  10.       ui->wSensorOnlyDisplay->hide();
  11.       ui->viewModeSettings->hide();
  12.     }
  13.     else if (compareString.compare("sensorOnlySelectButton")==0)
  14.     {
  15.       ui->wBannerSensorDisplay->hide();
  16.       ui->wSensorOnlyDisplay->show();
  17.       ui->viewModeSettings->hide();
  18.     }
  19.     else if (ui->weaponsSensorOnlyDisplay->isHidden())
  20.     {
  21.       ui->wBannerSensorDisplay->hide();
  22.       ui->wSensorOnlyDisplay->show();
  23.     }
  24.     else
  25.     {
  26.       ui->wBannerSensorDisplay->show();
  27.       ui->wSensorOnlyDisplay->hide();
  28.     }
  29.   }
  30. }
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this code gives me this error:

HEAP[PresQT.exe]: Invalid Address specified to RtlFreeHeap( 003F0000, 02C45BA0 )
Unhandled exception at 0x7c90120e in PresQT.exe: User breakpoint.

and it is crashing somewhere in free.c

I have commented out the the QPushButton assignment along with the string and the 2 conditional statements that involve the string, and it works fine... so it has something to do with the dynamic cast and the string assignment, but i dont know why or where the problem is...

anyone have any idea? help is greatly appreciated!