There is a bug fixed in KDE 4.7.4. When someone has non-standard keyboard layout switching shortcut (Like CTRL+/) and not alt+ctrl, layout switching does not work. Reproducible: Always Steps to Reproduce: 1. Install several keyboard layouts. Like US, DE, FR 2. Set global layout switching shortcut to Ctrl+/ or Ctrl+` or whatever, but not standard. 3. Pove that layout did not switch.
Created attachment 295615 [details, diff] Patch from a bug fix adopted to 4.7.3 branch Fixes a problem in KDE 4.7.3. You need to apply it to kde-base/systemsettings.
Thanks for reporting. Fix is available in =kde-base/systemsettings-4.7.3-r1.