I have a Zotac Zbox CI520, which was running the #0419 build. After I installed the #0503 something is f'ed up with the power and or IR-settings. After a shutdown it won't power up with the remote, I have to do it manually.
Rolling back to 419 solves it, so this broke with some build in between.
Edit: Build #0421 is the last one that worked.