Hi all.I registered today and got really excited with all the blocks that were available, but after getting about 10-15 it blocked me. Does anyone know if the limit is for a day, or I passed my limit "period." 

Hi, the limit for registered users is about 50 blocks daily. Make sure you are not using a shared connection or some proxy connection. AutoCAD users can use the addon application "Block Catalog" which imposes no limits.