I updated to the newest version and noticed some high-resolution images cause the contextual menu to interlace (slight jittering effect). This bug correlates to another issue where switching to a full-screen view causes the display to blink (it does this on all 3 of mine). However, this bug is limited to that particular IrfanView instance, so other programs thankfully do not suffer as a result.
I have an Imgur page that demonstrates these issues visually (or as best as I could in the case of the interlacing):
I have an Imgur page that demonstrates these issues visually (or as best as I could in the case of the interlacing):
