@TS
As you should know, STE is the original maintainer of installer 3.XX before selling it to RipDev. Right now the latest installer version is v4.0b6 and it's for fw2.x.x only. What u are facing might be caused by repo maintainer starting to abandon their repo for installer v3.xx. Most of them are or will move to installer v4 and the way it handle repo is different. That is just my own assumption, maybe i'm wrong about it.

p/s - since RiPDev took over installer, its been a piece of crap like their other apps. They just pass the popular installer app baton to Cydia. Cydia for me is becoming the defacto app and its good.