Just a sidenote:
I had similar
results caused by different issue source: I tried to install new Ubuntu, which did something daemonic with my extended JFS partition (350GB E:). As a result, this E: volume was not accessible, although in DFSee it was visible as "-e" and seemed to be in order. eCS just refused to access it.
One - although rather drastic - trick helped, proposed by Jan van Wijk (DFSee developer): manual change of partition type from original
0x35 (LVM) type to standard
IFS Bootable JFS eCS type 07. This helped and suddenly the partition started to be readable again, in fact, I'm using it successfully until now.
The point being that "something" in Ubuntu (later versions of GRUB?) touched without my knowledge the extended JFS partition and changed "something" in there. The result of this partition type change solution was that eComstation started to use
bootable version of JFS drivers to init & access the partition in question.
Nevertheless, the cause in your case seems to be quite different, so the question is if this is really worth a try

St.