I hit the wrong keys in mathematica and my keyboard language switched from US to dutch, but after I changed it back, it was my normal keyboard on the internet, but in mathematica it was still dutch. for example if i type this _ in mathematica is it this ? . How do I fix this?
Do you see the correct characters being typed in other programs such as a word processor?
What version of Mathematica on which operating system are you using?
I would first suggest resetting Mathematica’s preferences to installation defaults:
[http://support.wolfram.com/kb/3274
F](http://support.wolfram.com/kb/3274)rom your description, I imagine it could be a font corruption issue. Are you on a mac? If so, you may consider running through this tutorial which covers fixing a kind of font corruption that happens.
If this doesn’t help, I would suggest writing to support@wolfram.com with your license number or activation key.
Thank you! Problem fixed