Toad is launched on one PC and is accessed remotely using Windows Remote Desktop Connection (RDC). When the RDC is minimized and then maximized the following error is displayed:
"A call to an OS function failed".
Once 'OK' is clicked Toad continues to work normally.
WORKAROUND
None.
STATUS
Issue fixed in version 9.7.2. The latest version of Toad for Oracle can be downloaded here.