Joomla! requires a writable folder where it can write its logs. If it can't write its logs the result can vary from nothing happening to receiving an error message and Joomla! not working. It depends on many things, including whether you have enabled Debug Site in Global Configuration.
The best solution is to create a folder named "log" in your site's root that's writeable to Joomla!. Then go to Global Configuration, find the "Log directory" setting and set it to the absolute path of the "log" directory you've created. Alternatively, simply back up and restore your site. At the Site Setup step of ANGIE you can choose your temp and log directories' locations. Most likely this is also the reason you never saw any problem: ANGIE tries to use the "log" directory (without the trailing "s") by default when restoring your site.
In my opinion the fact that Joomla! uses the "logs" folder name by default is an issue. Plesk and many other server environments have a system-owned, unwriteable logs directory. Joomla! should cater for that as it's a common occurrence.
Nicholas K. Dionysopoulos
Lead Developer and Director
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