Ahh...seems we were looking in the wrong place
The unp999.tmp files show up there for me.
C:\Windows\Temp\_avast5_\
I haven't, that is where I have been monitoring, I use it so frequently I even have a shortcut for it.
I don't even get a flicker of the window and I rather doubt they would appear and disappear that quickly. Also when a web shield alert goes off, that unp file normally remained in the _avast5_ folder until you acknowledged the alert (my web shield settings are set to Ask) as it did previously.
Now I don't see that nor any indication that there are unp99999.tmp files created in that folder.