EPPlus 4.1 リリースされた。

Added functions Rank, Rank.eq, Rank.avg and Search
Custom function compilers can now be added via FormulaParserManager
Applied a whole bunch of pull requests (Thanks to everyone in the Community that has contributed)...
Performance and memory usage tweeks
Ability to set and retrieve 'custom' extended application propeties.
Added style QuotePrefix
Added support for MajorTimeUnit and MinorTimeUnit to chart axes
Added GapWidth Property to BarChart and Gapwidth.
Added Fill and Border properties to ChartSerie.
Added support for MajorTimeUnit and MinorTimeUnit to chart axes
Insert/delete row/column now shifts named ranges, comments, tables and pivottables.
And fixed a lot of issues. See http://epplus.codeplex.com/SourceControl/list/changesets for more details

EPPlus-Create advanced Excel spreadsheets on the server - Download: EPPlus 4.1

使ってみて気づいたのは セルの横幅をそろえる挙動が少し変わった(以前より広く調整するようになった）。
セル文字列が空白で終わっている場合、その分の幅を含めてくれない仕様はそのままの様子。