Can't edit page or save settings (move win -> linux)

[whiteh0rs3]

hi, thank you for the suggestions.

It seems that i already have the solution. I notice it when i can't upload any files to data/uploads/ folder.
After talking to the hosting owner, they told me that they have to make an adjustment to their apache mod_security configs. I'm not sure what config they have changed to make it works, but it works!