I had the same problem with 4Gb SDHC card ==> only showing the message "Loading..." From the site bigdennis.com I downloaded new kernel version 1.25 The 4Gb SDHC card works fine now.
download URL http://www.bigdennis.com/download/Firmware/R4-SDHC_English-1.25.rar
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solution for problem with R4 SDHC cards
I had the same problem with 4Gb SDHC card ==> only showing the message "Loading..."
From the site bigdennis.com I downloaded new kernel version 1.25
The 4Gb SDHC card works fine now.
download URL
http://www.bigdennis.com/download/Firmware/R4-SDHC_English-1.25.rar