Unable to boot after resizing boot partition with DD12 (bootable media)

This goes back some time. I have used DD10, then DD11 in the past with no issue. Some months ago I got DD12. I wanted to resize the boot partition from 60GB to 70GB on the m/c (XP SP3 at the time), and as it was the boot partition, I did this from the bootable media (as I have always done in the past).

It did it OK, resized correctly, so went to reboot and - nothing. Would not boot at all. In the end the only way I could recover it was to reinstall the boot partition and MBR from a TI full partition backup (also using bootable media). I tried it again - absolutely the same, did it every time. But, I have never had any problem doing exactly this using DD11 and DD10.

Contacted support and they could not come up with a solution, they said wait until the next build of DD12 comes out.

In the end I resized it with DD11 from bootable media. No problem at all.

As far as I can see, there hasn't been another build, 3223 is still the latest. Since then I have moved the PC onto W7 anyway. However I am extremely loath to try it again in case it does the same thing to W7 - don't really like reloading backups unless I have to.

So my questions are:
- is this a known problem with DD12
- if so does it only affect XP boot partitions
- is it only the case when using bootable media
- is there a workround
- if not is Acronis known to be doing anything about it