Sometimes saving brings up an error.

[ptoing]

Sometimes when I save I get this error. When it happens, no matter what, it will happen again and again until I close the program and restart.



If I try to "save as" from the menu, I get a crash dump.

Code:

Dump written 2016-6-25_11-28
Version: 2.0.5
Window: geom
Reason: function_clause

Short stack trace:
[]

Long stack trace:
[{gb_trees,get_1,[163,nil],[{file,"gb_trees.erl"},{line,243}]},
{wings_facemat,renumber_1,3,
                [{file,"c:/Users/uabdgud/src/wings/src/wings_facemat.erl"},
                 {line,266}]},
{wings_we,do_renumber,3,
           [{file,"c:/Users/uabdgud/src/wings/src/wings_we.erl"},{line,655}]},
{wings_we,do_renumber,2,
           [{file,"c:/Users/uabdgud/src/wings/src/wings_we.erl"},{line,643}]},
{wings_we,renumber,2,
           [{file,"c:/Users/uabdgud/src/wings/src/wings_we.erl"},{line,258}]},
{wings_ff_wings,renumber,5,
                 [{file,"c:/Users/uabdgud/src/wings/src/wings_ff_wings.erl"},
                  {line,1314}]},
{wings_ff_wings,export,2,
                 [{file,"c:/Users/uabdgud/src/wings/src/wings_ff_wings.erl"},
                  {line,1251}]},
{wings_file,save_now,2,
             [{file,"c:/Users/uabdgud/src/wings/src/wings_file.erl"},
              {line,427}]}]

I do have 2 older versions installed. 1.5.3 and 1.1.10 (because of fbx export which I need.)