I had the same problem but Appigo responded differently. Here is what they said (Nov 15, 2011):
We never have anyone reporting this but lets try this.
Please take a back up of your device:
http://support.apple.com/kb/HT1414
Open Todo and then go to:
Settings > synchronization > switch sync services > Toodledo account > then go back to synchronization > advance > perform full sync.
This may cause a few duplicates but it may fix this issue. Now check if the log is now the correct one.
Also check if your checklist are still intact that would help us to determine if the account is working well.
After doing this, my Todo sync log correctly showed my account level as 'Pro'.
BTW Toodledo doesn't usually answer questions in this forum. You're better off posting this type of support issue in the 'Questions' forum.