I really like IrfanView and have been using it for many years now. After upgrading to a Windows10 system, I installed the latest version of IrfanView and ran into two problems in fullscreen view:
  1. although the picture is larger than the screen it is not displayed using the full screen (see attachment)
  2. when moving through the folder upon orientation change the view is messed up, showing parts of the previous (landscape orientation) picture behind the current (portrait orientation) picture (see attachment)

Click image for larger version. 

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My System:
  • IrfanView 4.42, 64bit with plugins (64bit, of course)
  • Windows 10 pro, version 1511, build 10586.0, 64bit
  • Intel Core i7-3740QM CPU @ 2.70GHz
  • 16GB RAM
  • Resolution 1920x1080

I apologize if this is not a bug. Then please let me know what I've done wrong.