I've moved your post into the Amiga Hardware section to that anyone else with similar problems can find it easily.

Regarding your problem. It is due to you using an 8MB fast ram expansion with the A1200. Later cards fixed this problem, but earlier ram expansions and accelerators conflict with the PCMCIA card if more than 4MB of fast ram is installed.

Blizzard and similar 030 and above accelerators do not have this problem and work perfectly with PCMCIA cards.