data lost between sessions

[Lenore Horner]

Twice in the last two months I have opened Gnucash to find significant  
numbers of transactions missing from the registers.  Last month it was  
an entire block of time missing.  I was able to go back (very far  
back!) to an uncorrupted .xac file and then run all the  
subsequent .log files.  This was tedious, but did seem to have  
restored all my data.  That was on 2.2.6.  Thinking that perhaps there  
was a bug that had been fixed, I upgraded to 2.2.7 (the latest version  
in MacPorts in Dec. 2008).  Imagine my disgust when I opened Gnucash  
this morning to find that all of the charges in both my credit card  
accounts are missing.  My other accounts appear to be ok.  The credit  
charges are also missing in the relevant expense accounts.

I have not crashed the computer or shut it down without closing  
Gnucash and X11.

I have checked in Gnucash and the Filter is set to show all  
transactions.

The only thing that would even have read the file between this morning  
when it is corrupted and day before last when I entered a transaction  
(which does exist) would be the TimeMachine backing things up to an  
external drive.

Here are the last few lines of .xac and .log files.  Note that the  
file I saved on the 17th is significantly larger than the file opened  
this morning on the 19th.  I have done nothing myself beyond opening  
the file, so the deletions are all Gnucash inventions.
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Obviously, I will try re-opening the last .xac file that is 40kB.   
However,  repeated data-loss is absolutely unacceptable in a piece of  
accounting software.  Does anyone have any clue why this is occurring?

Thanks,
Lenore