Ok, after rebuilding my site (AGAIN), after getting this White Page of Death, I typed $SidebarWidgets in the templates/Layout/ Page.ss file instead of the /templates/Page.ss file, (suggestion - don't do that), I hit refresh and I have the White Page of Death. Again. Tried a dev/build/flush=1, still White Page. Appears to be stuck at the Security Login. Can't do anything because I can't log in. I'm using External Authentication. Mo had answered before but what I'm really asking, I guess, is it seems like every little thing causes it to "white out". Other than a complete reinstall AGAIN, does anyone have any suggestions? Thanks.
If you can't get back to a working version simply by reverting the changes it is likely that your apache user cannot clear your cache directory correctly. Either fix that issue, empty the cache dir manually or change the cache dir to somewhere you know apache can write (eg with define('TEMP_FOLDER', dirname(getcwd())."/tmp"); to use the /tmp folder in your ss root).
Thanks, I will try that. It appears that I broke the template I was using - when I changed to a different template name in the _config.php, it opened up fine. Does that still sound like it is not clearing the cache directory correctly? I will check my configuration to make sure that it is working correctly. Thank you again.