This has been fixed in iTeleport v5.4.2 — please update through the App Store.

There is a known bug with iTeleport for iPhone / iPad v5.4.1 — if you connect to a Mac, you may get a Stream Error, or the screen stops refreshing.  We've issued an update to fix this and it should be approved by Apple in a few days time.

In the meantime, a workaround is to go to iTeleport > Server Settings > Advanced > Encodings, and disable the Mac Rich Cursor encoding.  There's a bug where this is enabled automatically on each run of the app — so you'll need to do this each time you get the error — however, this is fixed in the newest update, which we're waiting on Apple to review and release.