ISBoxer.com

End up with an "argumentnullexception" error when entering through isboxer. Can get in fine when entering without it. Did patch the game client today so dunno if they disrupted something.

This was an issue with LOTRO quite some time ago; DDO is based on the same code. See if this helps: http://isboxer.com/forum/viewtopic.php?f=9&t=974

I'm getting that same error with DDO, I tried the fix suggested above. it allowed the first instance to load, now it won't let the other instances run, it gives the old "..is already running.. click to bring it to the front" so that more than 1 instance cant run.. I don't recall this error before

I was suddenly having similar issues when trying to multi-box DDO. Have had no issues for quite some time and then suddenly I was dead in the water. I have no problems launching DDO manually but when trying to launch via ISBoxer I was getting

Contents of log file C:\Users\Admin\AppData\Local\Turbine\Dungeons and Dragons Online\Launcher\Launcher_129647367216237795.log
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Launcher execution begins: 11/2/2011 7:45:21 PM 11/2/2011 7:45:21 PM
Command line: "C:\X\D\DDO\TurbineLauncher.exe" -usetdm -invoker 11/2/2011 7:45:21 PM
Administrator: True 11/2/2011 7:45:21 PM

<<< DELETED MASSIVE LOG FILE TO SAVE SPACE & REDUCE CLUTTER >>>

Going to Next Phase with QueueName: "15CC72DA-6210-4307-95D9-B8E149DBC256" and QueueURL: "http://10.67.112.64:7081/LoginQueue" 11/2/2011 7:45:55 PM
Transition to phase: LaunchControl 11/2/2011 7:45:55 PM
Beginning GLS Ticket refresh... 11/2/2011 7:45:55 PM
Refreshed GLS Ticket... 11/2/2011 7:45:56 PM
11/2/2011 7:45:56 PM
*** ArgumentNullException 11/2/2011 7:45:56 PM
11/2/2011 7:45:56 PM
String reference not set to an instance of a String.
Parameter name: string2 11/2/2011 7:45:56 PM
11/2/2011 7:45:56 PM
System.ArgumentNullException: String reference not set to an instance of a String.
Parameter name: string2
at System.Globalization.CompareInfo.IndexOfString(Void* pSortingTable, Int32 win32LCID, String source, String value, Int32 startIndex, Int32 count, Int32 options)
at System.Globalization.CompareInfo.IndexOf(String source, String value)
at com.turbine.launcher.UserControls.LaunchControl.LaunchTheGame() 11/2/2011 7:45:56 PM
11/2/2011 7:45:56 PM
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End of log file
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Followed Fix per Lax's link above and good to go. Fix confirmed for DDO for me also. Can run at least 3 clients at a time.