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}]}]

[micheus]

Try to select the objects and use Cleanup (Object mode). Maybe with the RMB option if you don't want to have shortest edges.

[Shadowvox]

Doesn't work. I'm taking a torus, cutting it in half, selecting all the vertices on one end and collapsing them to create a curved hook.
Now, a question. If one end of the torus is left open (no plane), would that cause the problem?

[micheus]

I just sent an PM to you. Please check it and give me some feedback.