Disappearing membership

I can't imagine anyone losing too much sleep over this bug but here it is anyway:-

Click on Members
Click on any initial (A-Z)
Wait for filtered list to appear
Delete the initial (with backspace) and then click on search
Approx 50% of the members fail to appear

er.. oh yes! [:?]

But I am the person in the L's with the most posts though, if that counts for anything?!