This is the first ever bug report I have made for XnView 1.9x as I have been devoted to XnViewMP for years now
Ok,
There is a nasty bug in XnView 1.98/1.99 concerned with middle-click to Fullscreen, in where Fullscreen get's trapped (unable to exit Fullscreen) and also the 'Status Bar', 'Toolbar' and 'Tabs Bar' gets disappeared!
This bug only seems to occur with high-resolution pictures from a camera that contain EXIF data (wierd) and not with any other type of picture.
Once you open a Camera taken JPG picture in the XnView view mode, you have to middle-click to Fullscreen and then once in Fullscreen middle-click multiple times to reproduce the bug instantaneously however the bug is more annoying when it happens on a normal basis of having to middle-click to fullscreen.
I have been noticing this bug in XnView 1.9x for over 1 year now
Pierre, I will have to send you in email a sample Camera picture along with a video showing the bug happening in order for you to reproduce.