While I was searching for a solution for this, I found about this "error".

If you press F2 and BEFORE a beatmap finish loading the Global Rankings you press F2 again, it will appear the message "No records set!" instead of showing the proper rankings.

Three people have already replicated this, so I can almost confirm it.

Can confirm: http://osu-ppy-sh.tvgratuite.org/ss/3010670

Steps to replicate:
1. Hit f2 to randomize maps
2. Right before the client selects a map hit f2 again

Steps to resolve:
1. Simply click a different map then go back to the affected one.

Yup! Or just press F5 and then the 2nd option.

Is just a bug, but just reporting it!

Can confirm as well, though replicating it works about 1 in 5 tries.

Sure, not very important though. Moving to low priority.

Pointless bump, but leaving this here. Please don't kill me.