Hi, Rolf,
That's really strange that it's only when its the first letter of a word. There are a few things to check in general, but I don't have a lot of confidence in them since just putting a "normal" letter in front solves your problem.
1) Be sure that the language encoding for your dictionary's headword is the same as the \t and \m lines of your interlinear.
2) Check Tony's suggestion that the special characters might have different encodings. This can be a probllem if the text and dictionary were typed at different times and potentially different keyboards. (If this is an entirely new project including new data, then that probably isn't the issue.)
One way to do this is to select your acute a, for example, from the interlinear and paste it into the Language Encoding in the Primary Sort sequence. If it's the same as what's already there, Toolbox will complain and not let you close the dialog box. But if it's different, then we have something to deal with. Do the same with the character from the dictionary.
3) Do Project, Language Encodings, and look at the list of make sure that you don't have any duplicated names in the left column. The file names can't be duplicated, but the internal name, which is what Toolbox goes by, can be duplicated without Toolbox complaining. This can happen if you've edited the Language Encoding with, say, Notepad, and saved the new version to a different file name. Toolbox picks up all the *.lng files that it sees in the folder with its *.prj file. If there are duplicates, the choice seems to be somewhat random.
4) Another thing you can do is to sort by the lexeme and then go to the start and then to the end of the dictionary. That's where Toolbox puts odd characters that aren't in the sort sequence. If there's some problem, your acute a and friends should show up there.
If you can't find anything that helps, send me the project to
Toolbox @ sil.org (no spaces) and I'll frown at it and see what I can find. (Thanks for the vote of confidence, Wayne.) By project, I mean your enough of your data to show the problem and all the various files in the same folder with the *.prj file. (If you used our New Project kit, it's the whole folder.)
I agree it's not elegant, but that's a very clever work-around!
Karen
Toolbox Support