An update to 9.1 is being released today, there are a few important fixes;
FIX: A random “missing pure virtual” exception could be thrown by the evaluator
FIX: Possible lockup if Listbox height is enough to show only one record but the row is multiple lines
FIX: SETDROPID could work incorrectly on dragging between 2 Clarion applications
FIX: The application generator could not open an app after you edited its dct and deleted a file that had aliases.
The complete list is here.