Not blaming the ROM necessarily, but I've flashed new ROMs on my device a dozen+ times now so I'm familiar with the process. I have a name brand card (replaced the stock LG card that came with the phone). After I updated the ROM it took a little longer than usual to do the initial boot and then got a corrupted SD card. Not saying the ROM did it, but all I did was flash ROM and reboot so not sure what else it could have been.
Formatted SD card since then and still having one or two SD card mounting issues. Going to try to reformat again, but seems like others (holangja1) are having similar problems. Perhaps its the standard SD issues that have popped up before and reformatting again will solve the problem, but figured it was worth noting.