500 Fixed by Patching Grav

What is your assessment of this solution?

A 500 error is thrown when cache/compiled/ is not writable.

Instead of a 500 error, which presents without explanation, the problem could be added to the issues list, making the easier to address.
You can see it running here (image attached)
http://devserver-017.info/

This is the php that detects the issue, when inserted at line 393 in vendor/rockettheme/toolbox/File/src/File.php

$dirParent = substr($dir,0, strrpos($dir,'/',-2)+1);
$fileowner=posix_getpwuid(fileowner ($dirParent));
$phpaccount=exec('whoami');
if (trim($fileowner['name'])!== trim($phpaccount)) :
//add to issues list
endif;

BETTER SOLUTION?
A better fix might be to include cache/compiled/ in the download instead of creating it with php when Grav first runs..

Is this helpful? Grav

exec'ing server binaries (which potentially don't exists, like on Windows) is a dangerous solution, not to mention potentially slow. I don't think this is the best solution to the problem. However, if you did come up with a better solution, a PullRequest on the toolbox project would be appreciated: https://github.com/rockettheme/toolbox

Regarding including this folder in the package, the problem is the cache/ folder is often cleared out completely including all sub folders (including cache/compiled/) so the folder does not to be recreated when missing. The fundamental problem is that your files including cache/ folder are owned by a different user than your webserver/php process. So this is where the conflict happens. We have provided some steps to address this in the Permissions Troubleshooting Docs.