Cannot open imported accounts

[Martin Millage]

After downloading and installing on my Mac, I imported my current  
Quicken data.  It imported without a problem.  After exploring a bit,  
I closed the accounts window.  To my surprise, the entire app shut  
down (not standard Macintosh behavior).

When I reopened gnucash, my accounts did not open, and I could not  
find them anywhere on my file system.  So I reimported, assuming that  
I needed to save explicitly when I created the new account.  After  
reimporting, I went to save, but that option was disabled.  So I tried  
the next trick, using save as to find out where the file is stored.   
No luck.  None of the files could be opened by gnucash.

Where is the file stored, and how do I open it?  Most applications  
will either open with the last file used, or at least have a recently  
used file list.  What am I doing wrong, that the imported accounts  
don't seem to be saved?

I tried to access the FAQ or wiki on line, but either the server is  
down, or the links on the main site are broken.