InputRT error

We previously were successfully able to use InputRT in a study. Now, however, when we attempt to run it, we get the following error:

Run-time error '6': Overflow

Can anyone help at all?

Thanks,

Paul
[URL="http://www.american.edu/academic.depts/cas/psych/bphp/people/paul.cfm"][/URL]

Are you running InputRT on Windows Vista or Windows XP?

Windows XP

I've tried running it and not typing anything. In that case, it works and creates a file. However, typing even two or three strokes causes it not to work. We would like to continue using the Medialab package, but this obviously presents a large problem.