I did this registry entry and it worked. Not sure how durable this is but for now it worked.
This was on an old Windows 7 upgrade to 10 and the lack of desktop refresh carried over. I have not often experienced this on many setups but nice to have a fix if is happens.
ShareX Set To Irfanview
I like ShareX to open a snip with IrfanView. Sometimes when updating, I lose that setting. This is one way to restore it. What likely change...
