Possible problem on latest core
I downloaded the latest perch version to build a new site and as I went to add my first page, based on a template I got this error
Parse error: syntax error, unexpected '[', expecting ')' in /mydomain/central/core/apps/content/modes/page.edit.pre.php on line 57
I managed to get a page up and when I went to view the page options it came back up. I tried a fresh install of the core folder and it appeared again.