[b]@RevenantEagle[/b] -- The zp-config.php file has changed, the errors you are seeing is the missing configuration for the kses html-filtering library.
Either merge your old zp-config.php into the new one, or just manually copy the new config lines into your old one. There are two or three or four I think, I forgot which.
[b]@thinkdreams[/b] -- Looks great! About the RSS feeds and other hacks, it's probably the new way images/albums are stored in their arrays -- they used to be objects already, but now they're just file and folder names (strings). That's where most of the speed improvement comes from. If you want an actual object from those names, you have to call `new Image($album, $filename)` or `new Album($foldername)` and then continue as normal.
[i]Edit[/i] -- Check the other thread you posted, but it's actually now Image->id instead of Image->getImageId() which has been removed. Sorry about that