We've gotten a report that the log fills up with this when the screen saver is active on HP ThinPro terminals: 2013-08-13T15:09:59: vncviewer[E]: Tue Aug 13 15:09:59 2013 2013-08-13T15:09:59: vncviewer[E]: DesktopWindow: Failure grabbing mouse 2013-08-13T15:10:00: Last line was repeated 1 time(s). 2013-08-13T15:10:00: vncviewer[E]: 2013-08-13T15:10:00: vncviewer[E]: Tue Aug 13 15:10:00 2013 2013-08-13T15:10:00: vncviewer[E]: DesktopWindow: Failure grabbing mouse 2013-08-13T15:10:01: Last line was repeated 1 time(s). 2013-08-13T15:10:01: vncviewer[E]: 2013-08-13T15:10:01: vncviewer[E]: Tue Aug 13 15:10:01 2013 2013-08-13T15:10:01: vncviewer[E]: DesktopWindow: Failure grabbing mouse 2013-08-13T15:10:02: Last line was repeated 1 time(s). 2013-08-13T15:10:02: vncviewer[E]: 2013-08-13T15:10:02: vncviewer[E]: Tue Aug 13 15:10:02 2013 2013-08-13T15:10:02: vncviewer[E]: DesktopWindow: Failure grabbing mouse 2013-08-13T15:10:03: Last line was repeated 1 time(s). 2013-08-13T15:10:03: vncviewer[E]: 2013-08-13T15:10:03: vncviewer[E]: Tue Aug 13 15:10:03 2013 2013-08-13T15:10:03: vncviewer[E]: DesktopWindow: Failure grabbing mouse 2013-08-13T15:10:04: Last line was repeated 1 time(s). 2013-08-13T15:10:04: vncviewer[E]: 2013-08-13T15:10:04: vncviewer[E]: Tue Aug 13 15:10:04 2013 2013-08-13T15:10:04: vncviewer[E]: DesktopWindow: Failure grabbing mouse Not sure why this happens as there is no explicit loop for the grabbing. Perhaps we're ping-ponging the focus between vncviewer and the screen saver.
Doesn't seem to happen on HP t610 with ThinPro 5, ThinLinc 4.2.0 client.