That is not something any of our testers experienced prior to release. Please let us know what model iPhone you have and what version of iOS it is running to help us troubleshoot. 

We cannot replicate that on our devices. Sheets are loading correctly on test iOS and Android devices. Do you have another phone or tablet you can check this on? It sounds like a device specific issue that likely would be resolved by deleting and re-installing the app. Note: AC Central v.4 (a completely new version) is coming out in a day or two so you could just wait for that update.

AC Central v.4 is currently in beta testing and it includes a filter by hymnbook feature. And the new search function lets you search within a specific hymn book.

Any missing hymns from any of the books currently included in AC Central are because of copyright limitations. The same is currently true for Hymns of Worship, but we are really close to getting agreements with most of those publishers (they have been very slow in responding to our requests) and expect to have those songs added in the relatively near future.

This is good feedback. We will check with the developers to see what it will take to fix that.

That is because this song (and numerous others) is copyrighted and we do not currently have permission from the publisher to post this in a digital format. That might change in the future if we can reach a reasonable agreement with publishers.

That's correct. That is one of the few songs in the Zion's Harp which is under copyright and we currently do not have permission to post it. 

We are currently testing the v.4 mobile apps. You'll know when it is released because it looks completely different. The browser versions have not yet begun extensive testing so smart TV browser compatibility is not yet determined.

Dark Mode is on our list of features to add in 2023, budget permitting.