As part of reporting in-line Q1 results, Websense (WBSN +4.5%) says it agrees to settle an outstanding dispute with the IRS relating to an audit of its 2005-2007 tax years. WBSN will pay $10M in federal tax plus $5M-$6M in state taxes and interest; it sees $4M in future tax benefits. The original amount of additional tax proposed by the IRS was $19M.