After attempted upgrade, blank screens.

[macandcheese]

Tried updating from 1.1.0.5 to the latest version. Wiped the directory (/), uploaded the new version and copied over the files from the old one (/mails, /modules, /themes, /img, and settings.inc.php). Navigated to /install and it recognized the old 1.1.0.5. Went through upgrade flawlessly, but the site is completely blank. I had another shop installed at /wholesale (seperate installation all together), that now shows up as a directory listing instead of the site. I backed up the whole "public_html" folder to my desktop beforehand, and I have MySQL backups for both (I only tried to upgrade the site at "/" for now, not "/wholesale"), but I don't think anything got overwritten during the upgrade of "/". Site is totally blank, need some help. Used Cyberduck so all files should have gotten copied, thanks for the help.

[macandcheese]

OK, got to the admin screen. I was using a edited theme before, but even after switching to the default one from the new version, still blank. Any help at all?

[TropischBruin]

Before upgrading you should always:

1. Switch to the Default theme.
2. Disable friendly URLS.
3. Copy a blank (empty) .htaccess in the root of your shop.
4. Disable ALL non-default modules..

5. Check if your shop works and looks OK.

6. Backup your database

7. Check wich versions are in between your current version and the one you want to go to (ignore the beta releases).

8. Upgrade from you version to the next and then first check if you shop still works and make a backup before moving on to the next version.

Attention: It is adviced to do the upgrade first on a test-server instead on you live-shop!