After installing the 1.4 update and re-starting my phone, WiFi no longer works. I tried to turn it on over an hour ago and it's still spinning. A web search revealed another complaint about this. This is a serious bug that should have been caught before releasing the update. After all, the main difference between the Pixi Plus and the Pixi is the addition of WiFi.
Did you ever get this resolved? I doubt it is a "bug" in 1.4 - I joined my home WiFi network to improve the speed, forced an update to 1.4 while I was setting there watching. It still took a while to download/unpack/install, but after the update it rejoined the same WiFi network with no problem - it just worked.