I'm not sure I understand. I removed the dash from zpbase-master as the dir name, and that DID allow me to change the thumbnail size, but that's not actually the fix.
[b]Solution[/b]
Mysql->yourDB->zenphoto_options->thumb_size->change value from "100" to whatever you want. I suggest ~300px.
Why has this not been solved in any of the other threads? I could have sworn I did a db search for "thumb" and "100" before, but I must have overlooked them to just find that entry now.
I do have another, minor, problem. I have some portrait thumbnails and landscape thumbnails sharing the same rows at certain resolutions, which makes less of a grid. I mean it's neat and it resembles some of the popular social media sites that jam thumbnails in every usable space, lined up or not, but is there a way to line them up, say landscapes line up with the center of the portraits? If not, I'm really okay and happy that my thumbnails are actually large enough that you can see anything more than splotches of color.