Thanks but the problem is plugins like DiviFlash which only work with ACF. They check in the code for the presence of ACF classes and call the methods to get the fields, even though they only support basic ones.
As a temporary work around - unless I give in and use ACF instead - I've also installed ACF at the moment and setup the same fields that I want to be able to get into the DiviFlash modules.
Is there a chance this will cause problems? It doesn't feel particularly safe, even though they are both doing the same thing (and I'm only using it for access to text fields at the moment - although images would be useful too).
Thanks