Cannot modify infill

Hi, I am trying to print a tamper and I cannot change the infill of the print. Initially it was 0.4 but I changed it to 0.9 and from that point I cannot reduce it.
I tried to slice at 0.1 and 0.2 layer height with 3 and 5 perimeters and this changes are working but when I change the infill at 0.7 - 0.5 - 0.4 - 0.2 it stays every time at 0.9. Is this a bug or am I doing something wrong?

I've seen a bug more and more frequently recently where changing values in the GUI will just not apply at all. If you make a change, save, switch settings and go back you'll see that the original value is still there. It's easiest to notice if you change a setting and the "Modified" flag does not show up, but that's only good if you don't have any other modifications. It's happened the most for me on .10, but I started noticing it on .9 as well recently. I don't have any real workarounds. Sometimes it seems that pushing the little arrows next to a text box to fiddle the value up and down will cause it to catch up and properly modify the setting, but it's not consistant at all.

Save your changes in the "floppy" icon in Slic3r. Also, you can click "File", "Export Config" and save the config.

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Waitaki 3D Printer

I always save my changes, i already have 10 different saves, each for a specific object.
I will try to go to a more early version of slic3r. Now I am using 0.9.10b.
Thank you guys, I will notify if I find any solution.

I tried with 3 different versions of Slic3r and the problem persists, the only thing that can be changed in the settings are the perimeters, everything else stays the same.

i ran into a problem like that once where i put a new version over a old version, the setting ini files were not compatable.

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[mike-mack.blogspot.com]

Can you tell me how did you resolved this problem?
I deleted all the previous versions of Slic3r and leaved only the 0.9.10b but the problem persists.

I did what you just did. Have you tried running slic3r from a different directory.?

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[mike-mack.blogspot.com]

Yep, deleted all Slic3r versions, downloaded the latest and moved it in partition C/(before it was in partition D/) but the problem is still there. I think i will reinstall my Windows to get this working.