CVS not case sensitive?

I am quite cvs dummy, and recently one of developers renamed our project folders into lovercase e.g. "Examples" into "examples".
Since then I am not able to commit any of changed files (adding files works fine).
Creating new project and checking out whole project still uses uppercase folder(which are empty), while Eclipse or WinCVS for example correctly use lowercase naming. our CVS server runs on Linux.
I am wondering what I am doing wrong.?
Thanks for any pointers,

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