My weekly Trusteer/Rapport report registered a 1000 instances of blocking alterations of the GetClipboardData function. They say this can be either malware or legitware. I've not noticed it before, although I didn't check the report in the last couple of weeks. Since clearing the report, the blocks are occuring roughly every 60-120 seconds (1-2 minutes), showing 2 attempts simultaneously. McAfee antivirus scan doesn't detect anything. I did have my Yahoo email account hacked last week, which may or may not be related. I have no other issues using Trusteer usually, although (on Firefox 16.01) sometimes the green icon has disappeared, and I restart Trusteer to ensure it is working. The icon then reappears.