Well. You might think this a big block. But I would disagree. The biggest block to creativity has to be my ISP, Virgin Media.
I bought myself a shiny new MBP the other week. Brilliant I thought. I'll be able to throw as much stuff as I want at it. My old Macbook was creaking from the stress of things.
But my connection from Virgin Media corrupts everything I try to download. Literally everything. DMG files constantly fail checksums and refuse to unpack.
So. I have lost a month of music making because of my ISP. I would leave but I have little faith in the alternatives as well. They are slow or even worse at customer service (i.e. charging for equipment repairs for example).