Hello,
i've experienced the same problems (i'm using the same versions) as Istrateo:
I programmed the show on my customer's iPad, then used mine to do some editing at home (swapping the playbacks to reorganize the layout, and renaming some of them), reopening it into the LPU-1 and then using the customer's iPad to control it.
1) At the beginning, no playbacks were working: the playbacks were not working at all, and when i tried to edit, it was like if nothing was stored in the cue (the cue and the devices were not red-colored), and if i tried to load the cue, nothing was happening and the devices auto-deselected themselves.
2) I tried then to open in the LPU a "backup" show which i made before the editing "at home", and after many attempts, i could finally start to use the show, but still with some not working playbacks, and with the same problems on some of them (not red cue and devices, nothing stored on the cue and auto-deselecting devices when loading a cue into the programmer).
As Istrareo said, it seems that this is happening when a playback is swapped, and only in some positions.
I'm using LPU-1 with the last firmware, and i'm controlling 8 Showtec Pixelbar 12.
Thanks!