Internal Error when Saving/Moving/Rotating

[Shadowvox]

Been using Wings for several weeks now, and all of a sudden I'm getting Internal error when saving. It happens sometimes when rotating or moving, but I can no longer save. I've tried both versions and 32 and 64 bit. Also tried running as administrator and compatibility mode Windows 8.
Windows 10
Bottom of Wings screen says "saving: renumbering"
Dump File:
Dump written 2016-9-3_22-19
Version: 2.0.5
Window: geom
Reason: function_clause

Short stack trace:
[]

Long stack trace:
[{gb_trees,get_1,[-2,nil],[{file,"gb_trees.erl"},{line,243}]},
{wings_we,'-do_renumber/3-lc$^0/1-0-',2,
[{file,"c:/Users/familjen/src/wings/src/wings_we.erl"},{line,678}]},
{wings_we,do_renumber,3,
[{file,"c:/Users/familjen/src/wings/src/wings_we.erl"},{line,678}]},
{wings_we,renumber,3,
[{file,"c:/Users/familjen/src/wings/src/wings_we.erl"},{line,269}]},
{wings_ff_wings,renumber,5,
[{file,"c:/Users/familjen/src/wings/src/wings_ff_wings.erl"},
{line,1309}]},
{wings_ff_wings,export,2,
[{file,"c:/Users/familjen/src/wings/src/wings_ff_wings.erl"},
{line,1251}]},
{wings_file,save_now,2,
[{file,"c:/Users/familjen/src/wings/src/wings_file.erl"},
{line,427}]},
{wings_develop,time_command,2,
[{file,"c:/Users/familjen/src/wings/src/wings_develop.erl"},
{line,81}]}]