The zooming bug is a known issue (please search before posting).
If Irfan View is freezing with very large images, try disabling the Undo feature in Properties, Misc1.
An image of that size at 1 BPP will require 225.31 MB (double that for undo), which shoudn't cause any problem on your system. However, do ensure that resampling is disabled. Resampling an image of that size will take a very long time.
I can reproduce this, but the colour depends on your background viewing colour.
I get a different issue with Fit Image to Desktop.
Please make a different thread for each issue (other than the zooming issues, which are known).
If Irfan View is freezing with very large images, try disabling the Undo feature in Properties, Misc1.
An image of that size at 1 BPP will require 225.31 MB (double that for undo), which shoudn't cause any problem on your system. However, do ensure that resampling is disabled. Resampling an image of that size will take a very long time.
If I activate "view->Display options->fit images into window" I get a black screen at "0%" size (which also happened with 4.0), but other that 4.0 I can't zoom in anymore.
I get a different issue with Fit Image to Desktop.
Please make a different thread for each issue (other than the zooming issues, which are known).
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