run time error 13

Hi everyone,

I've got the following issue: As soon as I try to open the Experiment Editor the message "run time
[SIZE=2][FONT=&quot]> error 13: type mismatch" pops up. It happened with v2008 and persists with v2010.[/FONT]
[/SIZE][FONT=Verdana][SIZE=2][FONT=&quot]Neither replacing the Experiment Editor folder nor a reinstallation worked.[/FONT][/SIZE][/FONT]
Any thoughts on that are highly appreciated.
Thanks