I cant replicate this one. The installer checks the permissions only. If you follow the recommendations in there you should be able to have it working. That said, not sure why 5.0 and 5.0.1 were working and 5.0.2 broken.
So either one permission was missed or there's a bug somewhere.
Error logging has been added for the installer in the usual place in version 5.0.3 so we can now better detect any problem. That has been released today.
I would recommend:
- download
- fresh install of all files
- run the installer
So if problems persist in 5.0.3 after a fresh install then it's probably worth a look at the Apache error logs to see what this might be.
Please send those along via DM.
More info on the release: