I installed ZenPhoto a couple of weeks ago, probably version 1.4.1.1, and had Flickered running. I had some other problems not directly releated to ZenPhoto and re-downloaded version 4.1.1 and upgraded to version 4.1.2 but no Flickerd in the themes. I am not sure which theme Zenphoto starts with and do not see a setup option to select a theme. I have downloaded the Flickerd theme directly, put it in the themes folder but can't fine a way to access it.
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You should be able to access the admin back-end by going to `yoursite.zen/admin`. From there, you can select the theme and change theme options.
From what you've written, it sounds as though you did some manual work on the theme files. If doing so, I would suggest to either keep a copy of the original theme handy (for reference) or to keep backups. That way, you can undo any such changes without needing to reinstall completely.