After an update to the latest build - 5.1.2.682- first run PL/SQL Developer - tabs (Spec, Body for package) from Program Window did not appeared - my Preference setup for Browser is: Double-click action: edit spec & body. Exit PL/SQL Dev and open it again - it looks okay-tabs are in place.
Next I installed new PlugIn plsqldoc-the problem occured again. It looks like that the problem is related to the install program.
Next I installed new PlugIn plsqldoc-the problem occured again. It looks like that the problem is related to the install program.