UltraVNC

The Problem exists also in 1.1.9.3. The Problem exists only if the "Poll Full Screen"-Option is activated. The Options "Poll Forground Window" and "Poll Window under Cursor" can be activated without errors.

Yes, same settings.
I think the problem has something to do how winvnc send the keyboard data to the edit window. For every keystroke the cursor moves two character positions. If I have time I will try to add some debug info too my demo application.

Not the server crashs.. the Application crashs during vnc session.

Since winvnc version 1.1.8 the mask-edit fields created with Embarcardero Delphi IDE do not show any character. Sometimes the application crashes. Until version 1.0.9.6.2 this works. Host is Windows 7-64 - no hook.dll - no mirror driver. Demo-Application can posted.