I think it is the card rather than the adapter which causes the problem, since the adapter is passive (nothing more than a cable really, perhaps with a couple of components for voltage adjustments). Though what you say is consistent with my experience, since the two cards I tried which failed to work in the EFIKA work fine in my A1200.
If anyone is using a CF card successfully with an EFIKA I would be really grateful if they could post the brand, model (if applicable) and capacity. If I can't find a working one I'll have to hope the bug is fixed soon since I don't have a 2.5" IDE hard drive I can use.
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moto