I have tested the new code on 32-bit Debian 2.6.26-19lenny and 64-bit 2.6.29-gentoo-r5. Both were OK and did not have any issues. Hopfully, your Ubuntu 9.10 will do the same ..
I did install and run mhvtl-2010-01-28.tgz/mhvtl-0.18-2 on ubuntu 9.10 x86_64 with no issue .. It did not complain about any incorrect MAM size. However, does this issue only affect 32-bit version , correct ?