Swiss 0.3 slot B issue

[Montblanc]

Hi friends,
I'm running ISOs from an SD card using SDML and swiss-lz-viper 0.3.
As long as I boot viper from slot A, everything is fine, but when I try to boot from
slot B, it freezes.
I also tried to boot viper from slot A, swap the SDML to slot B, then select
'slot B' when asked to, but after I get to "Executing game! 100% complete" it freezes again -_-
Any idea how to fix this?
I really need the A slot free cause some games look for a memory card in that slot.

[Montblanc]

So apparently I got it to work by setting SD speed to 16 Mhz. Still don't understand why
it runs perfectly on slot A at 32 Mhz but w/e.