Alexis - OK, seeing the epub problem now.
Bookmark crash, popup dict not switching, and disappearing definition after switch are known issues - popup can be worked around by turning off the "skip on button tap" option in Settings / Manage Dictionaries but will be fixed in Beta 2.
Reordering dictionaries: are you sure you have to restart and not simply tap on the dictionary switch button / enter a new search
LMA relates to it being an outdated database (buried in my lengthy announcement email was the note that everything but PLC/CC/ABC was using our old database format and might be a little glitchy), dots under vowels are an ABC thing (indicate tone sandhi), "tap again when clear" is actually the language we used in the old version too and it seems like most people interpret it as the same type of tap described in the first line (two fingers, in other words).
魏波德 - thanks! We've moved restore to the slightly more sensible Import/Export section for Beta 2. Other bug is a known one, I'm truly amazed at how many people use the "score-based subject selection" feature - it's been on the bubble for removal several times (and still is) but there must be at least half a dozen testers using it.