I followed this thread earlier as I too struggled to get my PCMCIA card to recognize CF cards. I tried reinstalls of the software needed....CF0: appeared mounted but no disk.
After months of trial I decided to go another route....i ordered the Compact Flash kit (card and adapter) from Amiga kit. After a reinstall of their software disk (an older version didn't help) my A1200 is now happily reading a 4 GB disk. Must be the phase of the moon!