TinkerTool to the rescue
In response to renewed problem’s with Lion’s feature/bug of finsishing diacritical letters (see this previous complaint), I have probably found the solution in the excellent free system tweaker software: TinkerTool.app.
The problem: following my own solution didn’t seem to be working, at least not in TeXShop, the graphical interface I use for writing in LaTeX: vowels keep disappearing because by typing on I did something to make the software think I made up my mind and decided to skip the letter …
Hopefully, TinkerTool, which has been an asset ever since it came around, does the job.
Needless to add, per the picture above: uncheck “Hold key to select diacritic characters”.
I hope this is now settled …