"Something like this" is not good enough

Without hacking boot scripts, Maemo expect 3 partitions in this specific order:
1. MyDocs (fat32)
2. OptFS (ext3)
3. Swap (swap)

These three can be of any size, but the order matters. Well, to some extent. The location of the swap partition does not really matter as long as it is not 1 or 2.

It sounds like you've created a new extended partition between MyDocs and OptFS. I have not tried that but I would expect this to not work because your Optfs would move to position #3 and the partition would be something like #5, thus effectively losing #2 where Maemo expects OptFS.

There should be an easy way out. You do not need to flash again. All you need to do is boot again, press W in BackupMenu and connect to GParted as before. Then,
1. Delete your new extended partition
2. MOVE your OptFS partition down, immediately after MyDocs (just use drag'n'drop in GParted)
3. Create a new PRIMARY partition in the empty space and format it as ext3
4. Reboot and enjoy.

NOTE: You really do not need extended partitions. You can create up to 4 primary partitions and that is all you need. Extended partition is merely a way to circumvent the magic limit of 4, in case you want more partitions. This is not Linux, this is how any computer works