Well a test at the second eicar link to the eicar.com file alerts, but not an Ask but direct abort.
http://www.eicar.org/anti_virus_test_file.htmWeb Shield Test -
http://www.eicar.org/download/eicar.com.
So I went checking my avast settings and I don't know why but my Web Shield is no longer set to Ask. So that would account for a lot of my issues. But I would have though I would still be seeing the unp99999.tmp files whilst normal browsing.
I have no idea why this setting was left at abort connection, I did a clean install after the beta but I went round the shields setting them to Ask, so I don't know if I missed this one or didn't OK my way out of the Expert Settings.
On changing the settings back to ask, I can see the offending unp99999.tmp file again, but during this not a single other unp file was displayed however shortly.