but i think the 747 does not log data in the internal memory in the bluetooth output mode. i am not shure about this information, i do not use the bluetooth mode yet.
imho the mobile phone software must log the data if the 747 is in bluetooth gps mouse mode.

i dont know the windows software, but if you have changed the record format without erasing the old stored data logs on the 747, this could produce the problems. i think this will change the the internal record size, so the already stored data does not match to the record fields and the reading software might get confused.

to resolve the no-display-problem, you can try a free gps java software for your mobile phone an connect it to the gps receiver by bluetooth. so you can see the coordinates and a map etc. on your mobile phone.

herzlich willkommen an bord!

i have a 747, it is the best receiver i ever tested, no complains at all..
i use linux and the bt747 java program from source forge,
with windows you need to install a driver for it.
http://sourceforge.net/projects/bt747/

if you need more infos, please contact me - german language if possible