QGIS 1.9 breaks some plugins (for now)
As part of the beta process QGIS 1.9 has started to implement the API changes that will lead to QGIS 2.0. These changes to the low level guts of the program have broken a few plugins. Personally I’ve come across two: OpenLayers and Points2One.
OpenLayers allows you to use outside map sources such as Google Maps and Bing Maps as backdrops to your maps. Currently it crashes when the plugin tries to load. Points2One takes point layers and makes lines or polygons from them. It loads, but crashes when you try to create the new data set.
Other plugins work just fine, for example, Statist is currently running perfectly. When the API changes are locked in the plugins that aren’t working will be able to be re-written to work with the new version. Until then, if you have a plugin you rely avoid the beta builds and stay with QGIS 1.8.
EDIT: OpenLayers has been updated to work with the new API. Just upgrade the plugin through Fetch Python Plugins menu and it will work just fine.