ToME: the Tales of Maj'Eyal

When I try starting the game after it updated to 1.3.1, I get a small window with "T-Engine4" in the title and an empty white content. Nothing further happens.
There is no entry at all in the te4_log.txt (file size 0 byte).

A short history of my usage of the game:
I got it from the most recent humble bundle. Humble provided a download link, which led me to the download of a zip file with version 1.2.5 in it.
I started it on my windwos 7 desktop after unzipping (no internet connection at the time), and it ran without a hitch. I played through the tutorial with no problems.
Afterwards I copied the folder to my windows 8.1 notebook, there the game ran, but had a weird resolution issue, where it only displayed part of the screen, despite running exactly the same resolution as the desktop (1920x1080 in both cases). No reset option or changing of resolution changed that, it just changed the viewable part of the screen around a bit.
The next day, I had a net connection available, and the launcher showed two patches available, which brought the version to 1.3.1.
After that, the game consistently shows the white engine window without responding at all. I thought maybe it took some time starting, but there was no change even after leaving it running overnight.
The result is the same for the windows 8.1 notebook.
I can still run the 1.2.5 version on both computers with the same issue on the notebook as described above.

Anyone got a hint what went wrong, or how I can fix it?

Try downloading 1.3.1 directly from the site; I know of at least one case where for some reason updating through the launcher was a problem for someone.

That actually worked, thanks. Should have thought of that myself.

I also figured out my resolution problem on my windows 8.1 notebook.

With the new version, the resolution always reset to 1280x1024 after a brief flicker with the chosen resolution. After I switched from fullscreen to borderless, I got a dialogue that asked me if I wanted to reset the graphics settings, and that actually did the trick, in borderless mode, the game kept the selected resolution and I could switch to my 1920x1080 resolution permanently.

Awesome, good to hear. Hopefully this information can help others with the same issue.