Not a huge fan of timeline view in Project 2010...not enough flexibility for formatting. The reason I created another Gantt chart view is so I can have one view with bar styles, font etc. preferrable for pictures in powerpoint presentations, and one view with different styles preferrable for print-outs.

Have you been able to replicate the issue, by creating another Gantt chart view in a new project? ...just using the basic settings: single view, Gantt chart, Entry table, no groups, all tasks?