Mouse tooltip is locking the entire system

Hello friends at www.oracle.com ,
after defining some tooltips to Forms fields like text items, display items, push buttons, etc., I've seen that the following sequence of actions may cause a system lock. (Assume there's a main Forms program, and a Forms sub-program has been called through main menu.)
1. Put the mouse pointer over a field that has tooltip text.
2. Close the Forms sub-program by pressing ALT-F4 (Windows shortcut to close any program); it will take you back to the Forms main program. (Tooltip text will still stay stopped at mouse position)
3. Move to another Windows program, like Explorer for example, and try to return to the main program. This main program is now locked, shows the 'Working...' message at hint line, and stays locked.
Only CTRL+ALT+DEL will stop it, and the Forms main program never sends any answer.
Could you please tell me why does a simple tooltip may lock an entire system?
Hope I was clear - if not, please ask me.
Thanks, and best regards,
Franklin Gongalves Jr.

Quit the App Store app and reset your iPad.
Double click the Home button to show the screen with running and recently used apps. Each app icon will have a sample page above it. Flick up on the page (not the app icon) and the page will fly away and the app icon will disappear. This quits that app. Then reset your device. Press and hold the Home and Sleep buttons simultaneously until the Apple logo appears. Let go of the buttons and let the device restart. See if that fixes your problem.

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