I see that tim mentioned some issues with,

Netgear routers corrupting file downloads.

I am using a Netgear WGT624 V3 router. 

I followed the link to WGR614vX - corrupt downloads: disable SPI and read those forum entries.  Strange stuff ... the originator (ZeBoxx) certainly did his homework. 

I made the changes suggested and 3 out of 3 downloads worked properly ... this does look like a solution ... at least for everyone who has a netgear router. 

Tim, as a double check, could you have your ISP contact netgear to find out if this an inherent problem with SPI or if it is a problem with the netgear implementation. 

Thanks

--
Martin
p.s. Do you have any idea why this came up only after switching to a new ISP?