http://bugzilla.lyx.org/show_bug.cgi?id=3622
I traced this bug a little bit and find some weird things going on. If you insert a Date external material, you of couse does not need any input file. Then, this dialog gives a default value '.', which is interpreted as 'current directory' by InsetExternal, and pass a path to converter. When the converter trys to lyx::sum() it, that function can not handle it, thus fail. Interestingly, if I enter any valid input file for this input, date will appear correctly. It is likely Uwe and others are using another version of lyx::sum (see support/lyxsum.cpp for details) so their function can actually handle a directory. My configuration uses the HAVE_DECL_ISTREAMBUF_ITERATOR version which fails at line 129. If I try/catch line 129-135 of src/support/lyxsum.cpp, my problem will disappear. However, I need some input on how things are supposed to work, if passing . is intentional, and how lyx::sum is supposed to handle this case... Cheers, Bo
