I've used the web version for a long time and just downloaded the iOS app (both are current versions).  However I ran into a major problem in the app where only the tags from Pu- and on are available on the list if I try to add them to a photo.  If I try to add one from earlier in the alphabet that I know is already used, it says I can't because it already exists, even though I can't see or select it.  Also, if I edit the existing tags on an photo, they get stripped off as soon as I enter the tag menu.  I couldn't find any mention of this issue before so I'm assuming something unusual is going wrong or misconfigured, but I can't find it myself.

Also I don't know if this is related, but using the search bar at the top of the home screen only ever returns a maximum of 32 results.  The cache is set much higher than is being used so that isn't the problem but again I don't see what is limiting it.  Both of these thing happen when I'm logged in either as an administrator or a regular user.  Thanks for any help.