Comment 9 for bug 1682779

i had the same problem

installation of gtk-sharp2 gnome-sharp2 from comment #6 didn't helped
installation of all suggested packages for monodevelop also didn't helped
change of default project director from comment #8 helped

interesting fact may be that directory which was set as default didn't existed at all. when i was creating new solution i set directory somewhere else, but monodevelop crashed. solution was partially created (first only folders, after installing of additional packages there were also files in them, but .sln with zero length and .csproj was prefixed with #temp or something like it)

when i changed default path and then created new solution then its path was already set in 'create new solution' windows and everything works correctly