Hi, it seems as if bug 4607 was somehow solved by one of the latest commits.
Now the program listings settings dialog (for listings that I edit in LyX) shows up correctly and LyX doesn't crash, but when I update something in the dialog my lyx file doesn't get updated. That makes the dialog just useless. Further I realized that the external file program listings dialog isn't able to handle German umlauts (in an UTF8 file) while LyX 1.5.4 was able to handle them. Each umlaut results in two cryptic symbols, so I think the dialog uses some ANSI encoding. Just for the record: I am using Windows XP. Dominik