It looks like there was a problem managing the link to the executable from /usr/bin. Hadn't been a problem through multiple installs and uninstalls in extras-devel, so either extras-testing or PR1.2 changed something. Anyway, I just uploaded fixed packages to both extras-devel and extras-testing and confirmed that they install and uninstall cleanly on my N900.

Promotion to Diablo extras seems to be working this morning, so PortaBase should also appear there shortly. I'll check that on my N810 once it appears in the repository, but I'm not expecting any problems there (it isn't optified, and hence doesn't need to manage a link in /usr/bin like the N900 version does).