OK. Testing accomplished.
I’ve re-installed MT-Blacklist, with some trepidation, as the initial install is what I think crashed the late, lamented bellerophon – grepping a series of long entries appears to have overheated the CPU.
The closest readings I can get from the project’s site are that the post-processing filter features are offline now (wise thought) and therefore I should not see the sorts of problems I’d encountered previously. MMM…. we’ll see.