Safari will not open my web based email messages from Excite.com

Ever since the latest system upgrade in june, My Primary email box. from Excite.com will not allow the messages to open completely. the new window starts to open then disappears in an instant. I don't have any issues opening the messages on my Back up browser (firefox). This is the only glitch I've noticed but it's a big one for me since this is my Primary email source. Any suggestions would be appreciated?

Thank you

Dennis