With Windows 7 if you are using fonts bigger than default you get empty listboxes for cars and tracks selection. Did this test: fonts 125% empty fonts 100 % text ok fonts 125 % no fonts fonts 100 % ok. Several users reported the same problem in the discussion of build 930, some confirmed the bypass of reducing font size worked. Further testing confirms that my instalation W7 with fonts at 100 % has no problems with legacy HDR enabled. Thanks.
So this might be an ugly workaround... and I make no guarantees... and it's been a long time since I edited the (rF1) GUI... http://www.gamefront.com/files/24814875/Core_UI_resized.zip I found all the fonts have scale values set to 1.0. So I changed them all to 0.8, which should reverse the 125% setting. Worked for me. Install it, select it in game, see what happens... if you want, uninstall it, delete it, I don't mind There seem to already be a fair few tweaks that could be made to the GUI, the question is whether it's worth bothering when ISI might release an update at some point anyway.