I must admit that there IS a difference in my environment and y’all’s. I have avast 12.3.2280 and this version certainly doesn’t seem to like something about IrfanView 4.50. b[/b]

I installed it again … and again, right after closing the last IrfanView window, avast threw up a Threat blocked message.

Then I conducted an experiment. I scanned the setup files for both IrfanView 4.44 and IrfanView 4.50 with avast, SAS and MB3 around 4 times each. IrfanView 4.44 would always pass all 3 scans with flying colors. IrfanView 4.50 on the other hand, every time that MB3 was scanning, avast would flag MB3 with a Threat blocked message like the 2nd one that I have attached.

Odd.