> I have to reproduce the problem to fix it. Why don't you go and modify midas/examples/experiment/frontend.cxx in such a way that 
> it creates exactly the banks you have, just with random data. If you see the same problem, send me your frontend file so that I 
> can reproduce it.

It would be good to pin point there the data is lost. This is the sequence:

frontend user code -> mfe.c code -> SYSTEM buffer -> mlogger -> disk

To see if correct data arrives to the SYSTEM buffer, run:
mdump -z SYSTEM

To see if mlogger is receiving events from the SYSTEM buffer, run:
mlogger -v ### mlogger should report all events, history and data

To see if mlogger writes events to disk, examine the disk file (in this case, you already did, data is not there).

I would guess that your data does not make it out from the frontend (mdump shows "nothing"),
if data were to arrive into the SYSTEM buffer, it would make it to disk, unless
mlogger is misconfigured (but you already checked that).

If you have trouble with the frontend framework code, you can try to switch from the mfe.c frontend
to the newer c++ tmfe frontend (see progs/fetest_tmfe.cxx and progs/fetest_tmfe_thread.cxx).

K.O.