BMC Software ( BMC) said Monday that CFO George Harrington has resigned "based upon mutual agreement" effective immediately. He will be replaced on an interim basis by Treasurer Stephen Solcher, who has held that position since 1992.

Harrington will stay on temporarily to assist in the transition.

BMC, which is based in Houston and makes system management software, did not offer a reason for the change in financial management.

"I want to thank George for his service to BMC," said CEO Bob Beauchamp. "Under his leadership, we successfully completed our year-end financial audit, strengthened our balance sheet and significantly improved our cost structure. George and I agreed that with these important milestones behind us, and with our recently posted positive quarterly results, the timing of his departure was optimal for him and for BMC."

In early August, the company posted a first-quarter loss, but with the hefty restructuring charges excluded, the mainframe software vendor beat Wall Street's expectations by 7 cents a share and then raised guidance for the year.

Sudden management changes often worry investors, and in recent trading, shares of BMC were off 48 cents, or 2.4%, to $19.94.