I had an old version 1.9.x of the nextgen gallery on a personal site. I hadn't updated in a while, so I went through and updated to 3.8.2, and the various other plugins as well, including gallery.
First problem came when nothing but the spinner would show. no errors, just the spinner.
So I copied my images off, and deleted the plugin and re-installed. no change. So I looked through the threads and found the roll back procedure. Did that with 1.9.13, and got back to the spinner issue.
Upgraded again, this time, got the MVC error. The only link that worked was the manage gallery link, and even that wasn't working quite right.
Tried some of the path mods I found, but nothing.
I've deleted and re-installed several times, and here's what I get:
1. install straight to 2.0.61, the only tab available is the "Manage Tags".
2. Install the older 1.9.13, it shows up, but I can't display any images.
3. Install 1.9.13 then upgrade... MVC error on most every dashboard page, and any gallery I try to show.
So... If all of the module exists under the plugins directory, what's in the MySql database that needs/can be deleted? Don't say nothing, because I've found some stuff just searching on the word 'next'.
I am close to just killing this plugin off & going with a different plugin, but I'm trying to be reasonable.
While I'm not a php programmer by trade, I am somewhat familiar with the language. I just haven't found a good answer on how to proceed.