I must be really stupid

[ladyramkin2000]

No: HPFGUIDX 103470

Having wasted an entire evening fiddling about with those bricks, I'm 
going to cravenly beg for help.  Every time I get more than four to 
register, they all disappear and I have to start again.  Obviously 
I'm missing something, but I'm obstinate as well as stupid, so am 
reluctant to give up.

Sylvia ( who realises she has just split an infinitive but doesn't 
care)