Redmine

I recently installed 3.3.0.stable on Centos 7 on Amazon EC2. Everything seems to work except for 2 issues - selecting the default columns and importing. Initially, some columns were showing under "Selected columns". All could be removed except for "Priority". Now no columns can be added.

There are no errors in the Apache logs or production.log. Clicking on the arrows in the Issue Tracking screen does not trigger any logging either in production.log.

Redmine 3.3.0.stable - checked
Default administrator account changed - checked
Attachments directory writable - checked
Plugin assets directory writable (./public/plugin_assets) - checked
RMagick available (optional) - checked
ImageMagick convert available (optional) - checked

Here are the version numbers:

Database: MariaDB-server-10.1.18-1.el7

Environment:
Redmine version 3.3.0.stable
Ruby version 2.3.1-p112 (2016-04-26) [x86_64-linux]
Rails version 4.2.6
Environment production
Database adapter Mysql2
SCM:
Git 1.8.3.1
Filesystem
Redmine plugins:
redhopper 1.0.4