Hi fuzzbuzzle,
As far as I'm aware, the 'ignore ' option is only for that scanning session, so it would be alerted later on when re-scanned.
Can you post the full path of the file and what the detection is?
Right click avast icon-->click 'Avast log viewer'-->click 'warning' section-->look at the bottom of the log (or click the date time header to bring the most recent to the top)
Or check the source file using notepad C:\Program Files\Alwil Software\Avast4\DATA\log\Warning.log and copy and paste the entry.
Can you find the file using explorer, and right click it and click scan, to be sure?
You could also upload the file to
www.virustotal.com and post the link back here
-Scott-
p.s. As I said above, I think this is the scanning method, but I could be wrong. In which case a correction would be appreciated