Nah, the key you get from the first quest is the same key you get from the daily quest - it disappears once you enter the dungeon. That's why the quest says:
No, it doesn't disappear. At least not for me.
I took out my good old Hippo to say "hi" to Lavalon. They haven't seen each other in a very long time, so I thought time for a re-visit.
After some running, some mini boss killing and Rokko at the end (or was it Rocko?...sorry forgot how it is written these days) I made my way to the bossroom portal. I took 2 screens, so you can clearly see I still got the 2 "dungeon enter keys" plus 1 " enter bossroom key" in my inventory still.
I pressed my portal enter key and triggered a game close, exactly at this point. (No worries, isn't that hard to do for me - I just have to switch on my anti virus tool. Yup, one of those DragonSaga does not like at all)
After finding myself back at the desktop I simply switched off my anti virus again. I started DragonSaga again and logged back in. The moment I saw Hippo standing in front of the Lava dungeon again I took these two screens.
As you can see I still got the 2 "lava dungeon enter keys" in my inventory (exactly the ones I started my little experiment with) plus the 1 "lava dungeon boss room enter key" I got inside the dungeon by killing the last mini boss. I did not loose anything, not a single key.
This is what once happened to me in the past already too. The time I had a "not triggered" real sudden gameclose. I was curious myself if they changed anything, or if I just have been lucky in the past. But either I'm still very lucky (very unlikely), or you really hit a bug here.
Cause after taking the last two screens I went directly back in, just running through the end - not even needed to kill the last mini boss (cause I had the needed key still in the inventory), killed Lavalon (sadly no heart drop ) and finished the whole thing.
What ever went wrong in your case I can't say. But you are right by saying you encountered a bug......of whatever kind......dunno.
Edited by Fliederduft78, 08 June 2015 - 10:30 PM.