Hello, Bob!

Your error message means the physical corruption of your database - some
index pages (with type 7) will be written instead data pages (5). Why - I
cannot say, this error is rather seldom and still elusive both in InterBase
and Firebird.
I think it is not a heavy corruption.

To repair, follow these step:
gfix -v -full ...
gfix -mend ..
(To see errors you should look in firebird.log file, not to output.)

After that try to backup without garbage collecting

gbak -b -g -v ...

and after that restore

gbak -c -v ...


If you want to know more, you can find a lot of useful links here
http://www.google.com/search?num=50&hl=en&ie=UTF-8&oe=windows-1251&inlang=ru
&safe=off&q=firebird+database+repairing&spell=1


Sincerely yours,
Alexey Kovjazin
www.ibsurgeon.com / www.ib-aid.com