Company plans to trim $20 million in operating expenses
Numerous lawsuits proceed over alleged patent infringement
Company takes impairment charge for student-loan investment
One-third of property information updates every 15 minutes
Re-launched segment seeks to lure more ads, audience
Hire is latest in a series of management changes
Former Realtor.com president will continue to serve as adviser
Shareholder group charges company blundered $130 million investment