Red means invisible (you’re options are set to invisible - only you see the red…other see the blue/gray or “purple” as you put it). Click on User CP > Edit Options on the left > Uncheck “Use Invisible Mode”
Green means online.
Blue/gray means offline.
If anyone has questions about this new setup and can’t get a hold of Singh or the others, feel free to ask me. I help moderate a webpage that runs this. I wouldn’t mind being a moderator here hint hint as I am much more local to this forum than the other one. lol.