Experienced with SciTE version 3.4.2 for OS X.
Typing "#define something(" (from start of line, without the double quotes) crashes the program.
something can be any form of string, including empty string.
Reproduced in editing existing file as well in new empty file.
Fix committed as [4417ad]. Should be in a release within 2 weeks.
Related
Commit: [4417ad]