I'm just installing ClassicWB OS 3.9 for the first time on a new 16GB CF card for use in an A1200 with ACA1232 accelerator. It GURUs on boot. Looks like I am having the same problem described here.
Is there a solution that does not require ACATune? I've never needed that before because the A1232 was being used in an ACA500 previously. It is an extra purchase if I am not mistaken. -- scratch that -- looks like a download is available.
Incidentally, I only have a single 500MB partition created on the CF card for now. I went for OS 3.9 as fresh install due to the support for larger partitions and all of the other enhancements that 3.9 brings.
