just upgraded from v2 alpha to the latest beta
Oh… just read this part… what alpha were you using? Upgrades from alpha to beta are not “officially” supported, but if it was the latest one then you may just need to clear your cache.
I documented changes (and manual upgrade steps) between alpha versions here: farmOS 2.x Releases (and What to Expect)
As a rule of thumb, always run /update.php and clear cache between updates, as described here: Updating farmOS | farmOS