@James First: Thank You for Your Efforts
I confirm the "Error press up"-bug ("Epu") still exists in firmware SP38
I first encountered the Epu after updating to Escribe SP17 and firmware SP35. Until that day my device ran perfect in Replay-mode.
After about 7 days messing with about everything in Escribe (not changing the Theme however) I downgraded back to firmware SP33.2. After that the "Epu" never appeared again for 10 days in a row.
Today I installed Escribe SP19 and firmware SP38. After letting the mod sleep for 15+ minutes (not before, I tested), the "Epu" appeared again. It could be repeated again and again by pressing "Upload settings to device" in Escribe. Same with "Restore Defaults": After the upload "Epu" appeared on the screen. I could only end this behavior by taking the batteries from the mod. Afterwards I tried again, letting it sleep for 15+ minutes, "Epu" showed, same behavior with Escribe.
2,5 hours ago I downgraded again to SP33.2, and couldn't get the "Epu" to appear on screen again, letting it sleep several times between 15 and 35 minutes.
Hopefully this helps you and Evolv a little. My device is a LV Paranormal DNA 250C with a board programmed May 25th, 2018. Please excuse my English!