Annoying new InDesign CC behavior 5/2018....
When replacing text by highlighting the text and then typing new text, InDesign misses the first letter of new typing, every time. I'm sure it was not always this way. It is annoying, to say the least, and could easily lead to typographical errors from words missing their initial letters, if it does not get caught. No other software that I use works this way. Please look into this bug!
Lucy Trumbull commented
I also had this problem, and the bug fix worked a treat.
Lindsey Thomas Martin commented
I think you will find the fix you need under Bugs, 'BUG Keypress doesn´t respond'.