Try running it in Fitzquake 0.85, Quakespasm, Darkplaces or FTE then. You will miss a couple minor bits. The white texture problem seems to be connected to certain early DX9 graphics hardware – Geforce FX cards, some integrated Intels and also an ATI.
Geforce 6x and equivalent ATIs should not exhibit this problem. If your card gives you white textures when trying to run RMQ, I’d like to know about it. Simply post a comment with the card model you’re using.