This is just a data point for those having problems with OLC files.

I last evening I downloaded a 4 hour flight logged at a 4 second intervals.
The secure .igc file downloaded in 12 seconds. The VL took 45 seconds to
'calculate the key' before starting the download. The high-speed serial
port card driver is set to auto-select the fastest bit rate without data
corruption. The desktop computer is a 2.6 GHz Win XP machine. The file
uploaded from SeeYou to OLC without a hitch.

This is MUCH faster than last year using an old 450 MHz Win 98 machine with
1st generation serial ports.

Bill Daniels