[SoothingDave]

Do any of the Catholic churches use actual bread rather than the disks?

I can only speak about the Latin rite, though I understand that the Eastern rites can use leavened bread.

For the Latin rite, only flour and water are allowed to be used to make the bread. If a Latin rite Church used a different bread would certainly be illicit and would very likely invalidate the sacrament.

SD

[x5452]

http://www.newadvent.org/cathen/01562b.htm

[x5452]

Found this too:
http://www.newadvent.org/cathen/01349d.htm