For the sake of posterity, the problem was with the directfb.slackbuild. Having re-built the package with src2pkg and re-installing, I no longer have an issue.
Well, splashy still errors
Code:
(!) [16867: 0.000] --> Caught signal 11 (at (nil), invalid address) <--
Splashy caught signal number 6. Exiting...
But that is not so important.