Hi, mulan84!
Glad to know You've got the simple workaround, TC 10.1 is quite up-to-date and well tested. Frankly speaking i'm still on 10.1 mostly.
But the question "what was wrong wis TC 11?" still exists. Probably it is Kernel issue. Trouble is that kernel panic didn't leave any traces, only screenshots. I can't guess what causes this, TinyCore creators and maintainers can try to find the answer, but I hesitate, is it so important. Older versions are fully functional, maybe missing some newer soft, but working well with accessible in repo.
I was sure, that if TC10 works on some box, then TC11 will too, but it appears to be wrong assumption.
Have a nice Core!