Tcl/Tk version 8.6 is relatively new, released in December 2012. Scidb was crashing if compiled (and linked) with this version. If you have this problem, please re-build Scidb in the following way:
> svn update # update to version >= 681 > ./configure > make clean > make > sudo make install Don't forget "make clean", otherwise the problem will remain. If you have both versions of Tcl/Tk installed, version 8.5 and version 8.6, the configure script should prefer version 8.5. This did not properly work, but I added a missing search path, and now version 8.5 should be found. If not, please post an error report (use the bug tracker <http://sourceforge.net/tracker/?group_id=307371&atid=1294797&source=navbar>).