Clo wrote:
• “Rotate” could be greyed out if the image is a multi-page¦multi-frame type…
Right, or an animated GIF (which is a special type of multi-page image).
Well, it was neither multi-page nor animated. Just an ordinary, rather big
(1500 ... 4000 pixels per dimension), image, and both bugs occured after
a large amount of edits.
check/observe the problem with XnView 1.90 RC1
OK, I'll upgrade to RC1 or RC2 ... but since there is no safe way to
reproduce there is also no safe way to verify a fix

There is indeed no WinZIP under my rock.