Did you restore your desktop wallet with the recovery sentence but there are transactions missing?
Then first try in the Tools menu –> Re-scan for transactions.
The blockchain will be scanned again, this may take some time. You will see a progress bar.
If that doesn’t help, close the wallet and go to the hidden directory/folder of Gulden and rename there the file wallet.dat to wallet.old and restart the wallet.
The hidden folder can be found in Windows c:\Users\Eigenaar\AppData\Roaming\Gulden\
and on a Mac ~/Library/Application Support/Gulden
CAUTION these are hidden folders, you may need to check first in explorer/finder that you can view hidden items.
This post is also available in: Dutch