Using: 2.6 Beta 2
PC: Dell Laptop Windows 2000 SP5
I've found some very unique instances underwhich I cannot change the zoom level using the pull down selection list of 1% to 3200%.
The first example happens with a black and white (1 bit color) tiff image with Group 4 Fax Encoding. The image is 5100 x 3300 pixels and 61.15 kB in size.
If I adjust the zoom level to anything greater than 600% (meaning 700% to 3200%), I cannot use the zoom level pull down selection again ... if I do, it just stays at that level. For example, with this image, if I zoom into a level of 800%, and then try to select another zoom level with the pull down, I cannot get it to change from 800%.
If I hit the + and - buttons next to the pull down list, it will change. But, what's interesting is that for ANY of the zoom levels from 700% to 3200%, when I high the - zoom button, the level changes to 600%, and hitting the + zoom button, the level changes to 642%.
Now, I have another image for which I have a different zoom issue. This is a 256 color (8 bit) PNG image that is 51x80 pixels with a file size of 3.75 kB.
For this image, if I select a zoom level of 66, 50, 33 or 25%, I cannot change the zoom level using the pull down list. For levels less than 25% and greater than 66%, the pull down list works fine.
Again, here are some detailed notes that may help debug. At each of these settings that I cannot change, here is what happens when I click the + and - zoom buttons:
66% + button changes to 100%
66% - button changes to 49%
50% + button changes to 65%
50% - button changes to 31%
33% + button changes to 49%
33% - button changes to 24%
25% + button changes to 31%
25% - button changes to 16%
As I've noted, these are specific to the images I've been testing. If you would like the actual images to test for yourself, PM me.