Major bug: Occasionally upon server crashes/restarts, some people's Skill Trees are bugged out. No skills are shown as learned and you may not craft anything but all the points are used. Relogging rarely fixes this. Respeccing fixes it. Verifying integrity of game files through steam fixes it.
This is one of the data issues we're investigating at the moment, definitely a high priority bug that we hope to have resolved as soon as possible.