I've tested this on both my laptop (OS X) and my desktop (Ubuntu) but not a Windows box. As @til_b says, the problem seems to be that the .dbf has a different name to the .shp and .shx files. After renaming the file behaved much better. I also suggest you dissolve the layer using Vector > Geoprocessing Tools > Dissolve toolset. After dissolving I was able to add, delete and edit features. Hope this helps.
Phil
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