wrong bh size with 2.4.10

Hi, Using 2.4.10 with the patch from http://w1.894.telia.com/~u89404340/patches/ I have found that, when trying to run mkudf, mke2fs or anything else that works directly with the block device (such as setting up a loop device on it) on /dev/pktcdvd0, I just get lots of 'wrong bh size' messages in my dmesg output and nothing gets written to the disc. However, the driver seems to work fine with CDs prepared (ie. mkfs'd) under earlier versions - they can be mounted and accessed normally. Has anyone else seen this? Stephen