Hi there,
There is an extensive discussion about this here:-
[Link: remotecentral.com]In a nutshell, it looks like there is a size limit on the MMC cards that iPronto is capable of recognising. It seems that only very small cards (I think 64 Mb, although I think one person managed to use a 128 Mb card if I remember correctly) are able to be used.
Check out the above link for more detailed help with this though.