In /etc/sane.d/dll.conf mustek_pp is listed but the file mustek_pp.conf is missing. Reproducible: Always Steps to Reproduce: 1. 2. 3.
Sorry, I must have missed the notification mail and just noticed this bug. Will check tomorrow.
Sorry again, I currently don't have access to my development machine. Will have to wait until next week.
Bad news - my dev box is in another city and powered off. The guy who could turn it on does not respond (holidays?), so I can't do much about this right now. Sorry again.
Good news: Got access to my box. Bad news: Can't reproduce your problem. Which sane-backends version are you using? Where's your "emerge info" output? Are you by chance using amd64 and a version < 1.0.15-r2? If yes, please try this version.
Closing due to lack of response. Please re-open if necessary.