Crushing, sync issues, no backup/restore anymore!

The app is crushing and I cant even open it.

Edit 2 v5.5.1:
The crushing issue has gone since the last update but there are still couple of issues.
1. The sync toggle on the iPhone and iPad goes off on itself after closing and restarting the app which stops the syncing process.
2. Manual backup through wifi is still inactive. I havent tried to restore from Dropbox, but backing up to Dropbox manually or automatically is not possible neither.

Edit 1 v5.5:
Ive finally downgraded to the previous version through iTunes that has the version 5.4.3. I actually deleted my iPhone app and reinstalled the 5.5 and signed in, but it wouldnt let me to restore from my backup. Also the sync between iPad and iPhone running 5.5 was not working neither. And lastly my Dropbox sync, that was working just fine was replaced by this new sync system which seems to have broken everything. The worst update this far.

Hethut about Pocket Expense 6, v5.5.1