Some users have reported this problem and I am having the same issue on every computer I own.
I guess I know how the problem has started, but not how to solve it. The problems start after opening a second SLG or SL2 file, without closing the first one. If this happens, it is not possible anymore to use the sonarlog viewer.
"Hi, I have some strange problem with my Sonar Log Viewer. It installed and worked ok for a while. Now when opening a *.sl2 file a window is minimized in the left corner and the program freezes. I tried to uninstall an install again. Same problem occurs. Could not find much in the registry to clean either. What could be wrong ?"