AutoIT v3 - cant get focus

[StephanNew]

There is a problem i cant solve on my own. Well, i ve written this script part: If WinExists("Application") then  WinActivate("Application")  ...  ... Else  MsgBox($MB_OK,"Attention", "openSiebelOrderScreen: Application not found!")   _endAutoIT() ; ends the script at all EndIf   This works well on all Windows 8 Computers, but one. There is one Laptop system, running Windows 8 as well, but i cant persuade this computer to get the Application-Window in front with the given script part. I have Opt("WinTitleMatchMode", 2) enabled and the Application Name is correct. Has somebody the same problem, or maybe a solution for it?