Hello,
I just installed PyBOMBS on Ubuntu 14.04. I'm noticing that sometimes the icon labels are readable, but a lot of them are off the screen and can't be selected, like UHD. The last icon available to install for me when this happens is osmo-tetra.
To overcome this, I close PyBOMBS and restart it. Usually after this, I am able to see all the icons, but they are squished in such a way that I can't read the labels of that are missing a thumbnail picture. I can read UHD, gnuradio, gnss-sdr, etc. because those have non-default thumbnails. All the icons with ? thumbnail pics are unreadable.