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I did a thorough check and found that the \ key worked properly in other programs. The problem still persists only when using Textmaker or Texstudio.

I switched to TeXstudio and the same thing happens. The "\" key is the one that usually starts misbehaving first.

Has anyone experienced the same thing?

I use Texmaker (3.5.2) at work all day long, both on Windows and Mac computers. I have a strange thing happening. After using it for a few hours, I get incorrect characters appearing. For example, an accented capital E begins appearing whenever I enter the \ key. It is a relatively minor nuisance. I...