I've just had a strange problem.
I realized that Wifi was not working (it was automatically disabled after a few seconds searching for networks), and knowing that there were alternative kernels for the wifi I thought that the problem might come from there.
I flashed the latest moldovan kernel (SS-RLS7-New-Moldovan-Stock-Kernel-Gen2), and after reboot my sd-ext partition was gone.
I opened S2E and saw that everything was greyed out. I tried to go in settings > mount as ext4, but it was already checked. Cheking/unchecking, rebooting, etc... nothing seemed to help.
I then tried to flash the other kernel (SS-RLS7-Stock-Kernel-Gen2), but same problem : I can't remount my ext partition.
I did nandroid backup, and it went through the "backing up sd-ext" process, so I assume that my sd-ext is still here and good.
I checked kernel's updater-script, and can find nothing that could harm my sd-ext partition there.
What else can I try ?
Ah, I forgot to mention that I totally forgot to do a nandroid backup BEFORE flashing the kernel, that would have been too easy