FreePBX Upgrade from 2.7 to 2.9

Site was running using FreePBX 2.7. Since the internet can be slow at this location, I thought it would be best to update via the tar file.

The installation went fine, no errors.

After the installation when I log in the screen is blank.

Any thoughts?

Can you check your apache err logs and let me know if any errors are present when navigating to the web administration page and logging in?