I think it has something to do with running Olipro 2.7, then changing to Olipro 2.4.
I found that the cure is to:
Get back to stock (the 2 folder method)
http://forum.xda-developers.com/showthread.php?t=376829
Run Olipro 2.4
Flash radio 3.42.50
Flash custom ROM
http://forum.ppcgeeks.com/showthread.php?t=81794
Check post #5.
EDIT:
Like shaggylive said, allways hard reset after every flash.
And sometimes an aditional hard reset can make a difference.
Olso, try to do your flashing with the SD card method as Mouser Electronics only sells the USB jack for the 5 connector plug.
I am still trying to find the 11 connector jack.