Potential Karma bug, patch issue, or just my computer?

I tried to take a screenshot of this weirdness, but when I went to paste it... it was solid black. Anyway, my health and objective bar were completely transparent. Every time I took damage my health bars would flash red. It would also lag occasionally. I'm 100% sure I took a screenshot of this as well. Does anyone know what it could be? My Internet speed is perfectly fine, and when I checked to see if it would do this again in practice mode it stopped. Given the evidence, it could be my computer? If anyone can offer an explanation that'd be swell.