Thanks for using this app and reporting this bug!
I am aware of it, but I need time to dig and properly resolve this issue. For now I made a simple workaround which should satisfy you. Please download new version
. To make accented letters work properly, please select "UTF-8 Encoding" from Fonts menu (accessed by pressing <ALT> 3).
This is quick hack and still buggy. You will notice for example that first press of accented letter will fail, but afterwards it should work.
I will not have more time to improve it now, as I will be away from my computer and kindle until september