Zone Labs has fixed a bug in a recent upgrade to its security software that is <A HREF="http://news.zdnet.com/2100-1009_22-6086095.html?tag=zdnn.alert">causing trouble for some Eudora and McAfee users.</A> The problems relate to ZoneAlarm 6.5 products released last week, the company said Tuesday. One glitch means the software won't install alongside McAfee antivirus products, while another interferes with date and time stamps in Qualcomm's Eudora email client.