[false+] Wings 2.1.5 won't load files: "Read failed: corrupt Wings file" (Linux)

[Loci]

I can reproduce the error as follows:
New file, create a torus with x sections and y slices. Save the file. Open the file or Revert.
x=90, y=20 => ok
x=91, y=20 => error

That cannot be reproduced in Windows

Maybe it's a Linux specific problem. I can't tell. It's just what I found out.
I have no problem working with a torus of this size as long as I don't try to close & reopen it. So maybe it's a problem in the area of saving the file structure or opening it. Unfortunately I didn't find any error messages in the logs.

Versions:
System: Gentoo Linux + KDE
NVidia drivers 381.22
wings 2.1.5
erlang 19.1
cl 1.2.3
libsdl 1.2.15

Just a comment: SDL isn't used by Wings3D anymore. It was replaced by wxWidgets library.

It's defined as dependency in the Gentoo ebuild. I have no idea if it's really used or just a leftover from an old version.