Import not working with clean URLs

Hi,

I just tried node import serveral times with Clean URLs/ pathauto module activated/disabled. When clean urls are activated there seems to be several conflicts:

1. I cannot import nodes. I always get an empty white page when i press on step 3: next (preview)

2. URL rewriting for already imported nodes doesn't work. No alias will be created and the system paths ( for example node/301) doesn't work. I also get an empty white page.

Everything works fine when clean URLs and the related modules (pathauto/token/path) are disabled.

Thanks for any help.

rainer