This happened to me too and apparently, is a problem with the student version. Arnoud helped me figure out a work around for this. In your `$UserBaseDirectory/Licensing`

, you should find a `mathpass`

file that looks something like this:

```
(*userregistered*)
machineName1 ID ActivationKey1 Expiration1 UserName
machineName2 ID ActivationKey2 Expiration2 UserName
```

The first line is (most likely) your activation for the trial, and *Mathematica* 8 for students apparently tries to use this activation key and converts it to a trial version.

In my case (OS X), *Mathematica* 8 kept crashing, and Arnoud suspects it's because it tries to bring up the trial window at startup, which does not exist. You seem to not have that issue, but the workaround (for now) is to comment out the activation line (with a `%`

) for *Mathematica* 9 trial version when you're not using it and then launch *Mathematica* 8.

Oh, and the problem seems to be primarily with the front-end, as I can launch a *Mathematica* 8 kernel from the command line simultaneously with *Mathematica* 9. So if you only need it for computations, that's another option.

If you have a backup look for the

– Ajasja – 2012-11-29T14:50:54.143`mathpass`

file. http://reference.wolfram.com/mathematica/tutorial/RegistrationAndPasswords.htmlDo you have a student version? – rm -rf – 2012-11-29T14:50:57.897

yes, student version – Aart Goossens – 2012-11-29T14:53:00.887

i don't have a backup file (at least couldn't find it). In my mathpass files are two licenses: the top one seems to be the trial license, the bottom one my student license – Aart Goossens – 2012-11-29T15:07:38.797