I got the problem. After enabled and configured Boost, I cant change any single setting on the site, nothing gets saved. When hitting "Save" button on node edit form or any other submit form, the page just gets reloaded submit not working.
This problem occurs only in the dev-version or Version 1.1. Version 1.0 is working well.
1. First install version 1.0 of the module. Activate that module. Go to admin/config/system/boost/htaccess/generator and take the proposed changes into the .htaccess file.
2. Install the dev-version or any latest version like boost-7.x-1.1. Don't change the .htaccess file!
3. Now everything should work again.
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