...but, strangely enough, only in some circumstances. To reproduce: 1) Set client to "Near current screen size" without fullscreen 2) Connect to a system that requires you to enter a OTP After the OTP window closes, the following error appears at the console (the hex value differs): X_GetWindowAttributes: BadWindow (invalid Window parameter) 0x540021e On Gnome 2 there are no ill effects of this, however on Gnome 3 the session appears to freeze until vncviewer is moved or focus is switched.
We haven't seen or heard of this for some time. We assume it got fixed somewhere along the line.