My SDBox arrived from Amigastore 2 weeks ago, and using the most updated (v0.3!) drivers SD0 and spisd.device (in devs: ) and fat95 in L: -> you guessed it, no bueno
Power LED and internal nano LED lit. Power is stable +5V (how many amps does this need?), and nothing is wrong with my A500 w/3.1 and GVP HD8+. Interestingly 2 things do happen: I get random flicker of the whole Amiga desktop (workbench) when not using interlace modes, and using CLI typing in "SD0:" I see SDBox brief activity led flicker x1, and ": bad number" as a response. SD0: reports being mounted. Very strange!
For the record, tried 2 SD cards of 1 and 2 GB max size, single partitions, fat 32 and cleaned using diskpart.