This version fixes problems with the plugin update option, with updating from an old Geeklog version, and also fixes a (non-exploitable) SQL error with comment notification emails.
We would appreciate any feedback on this release candidate. Also, if you have a chance to run this version on a test setup, please try to upgrade a copy of your site's database to help us ensure we've solved all the upgrade problems now. Thank you!
If all goes well, the final 1.8.0 will be out by mid-June.