I tried the Zotero beta version and now my database seems to only want to be accessed by beta Zotero. How do I reset to the standard ( nonbeta) versions??
One question is why you want to revert to normal -- the beta is going to get released relatively soon, so if there's a problem, you'd probably want that addressed.
The most reliably way to revert to the regular version is to use the automated back-up Zotero made when updating the database, see https://www.zotero.org/support/zotero_data#restoring_from_the_last_automatic_backup (check for the date on the various automated .sqlite.bak version to find the one for the update). If you have your library fully in sync, you could also move your data folder somewhere else, start with an empty database and sync.
The most reliably way to revert to the regular version is to use the automated back-up Zotero made when updating the database, see https://www.zotero.org/support/zotero_data#restoring_from_the_last_automatic_backup (check for the date on the various automated .sqlite.bak version to find the one for the update). If you have your library fully in sync, you could also move your data folder somewhere else, start with an empty database and sync.