The width of the swimlanes now depends on its content, which seems a sane default.
Please provide a skinparam to set the Swimlanes width.Something like: swimlaneWidth: [dynamic|equal]
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In last beta https://dl.dropboxusercontent.com/u/13064071/plantuml.jar we have added a new skinparam.
You can use skinparam swimlaneWidth same if you want all swimlanes to have the same width.Note that you can also specify a value (in pixel): skinparam swimlaneWidth 500In that case, the minimum width of swimlanes will be 500.
Example:
skinparam swimlane { BorderThickness 0 TitleFontColor black TitleFontSize 30 width same }