When I switched to this model from a PI 3 B, I continually got the lightening symbol. Is the PI TOP v1 capable of running the B+.
I tried Pi-Top OS on the B+ and it did not work. Someone from Pi-Top told me they were working on creating an OS for it that will work, but so far I haven't heard anything back.
Had this same problem and yes, updating to the latest OS fixes it.
I too had that issue, but after downloaded and installed the latest Polaris release (April 2018) all started working w/out any issues at all. I had to use Etcher.io on a Windows 10 machine to flash the microSD card, and that took about 10 minutes. Success!
I finally loaded the new version of Polaris and can confirm that all the errors that I had reported have been resolved. It also a bit faster at charging as well, which is a bonus.