I receive this message: Digitizing Tools: Amend Line is disabled because layer CRS and project CRS do not match.
If I set the CRS of the layer the same as the project CRS (W84 Pseudo Mercator) is misaligned and in a unknown location.
My project is EPSG: 3857 / WGS 84 / Pseudo Mercator
First layer is a Bing Aerial (Web > OpenLayersPlugin > BingMaps > Bing Aerial) - CRS: EPSG 3857 / WGS 84 / Pseudo Mercator
Another layers with shapefiles lines and points captured from OSM. - CRS: ESPG 4326 / WGS84, which is OK on top the base layer.
About the error: the layer in question is a shapefile line layer (roads) - CRS: ESPG 4326 / WGS84, which is OK on top the base layer.