connection failure on a google account

I installed EMClient 7.2.36908.0 and connected it to my Google Account and it all went fine, started to sync (Calendar, contacts, mail subfolder structure) but after a few seconds a get the red triangle with “Connection Failed” … In the logs here is what I have :

15:56:53 System.ArgumentException: An item with the same key has already been added.
15:56:53    at System.ThrowHelper.ThrowArgumentException(ExceptionResource resource)
15:56:53    at System.Collections.Generic.Dictionary2.Insert(TKey key, TValue value, Boolean add) 15:56:53    at System.Linq.Enumerable.ToDictionary[TSource,TKey,TElement](IEnumerable1 source, Func2 keySelector, Func2 elementSelector, IEqualityComparer1 comparer) 15:56:53    at System.Linq.Enumerable.ToDictionary[TSource,TKey](IEnumerable1 source, Func2 keySelector, IEqualityComparer1 comparer)
15:56:53    at MailClient.Protocols.Imap.Synchronizer.SynchronizeFoldersCommand.ExecuteInternal(WorkerStatus status)
15:56:53    at MailClient.Protocols.Imap.Synchronizer.ImapCommand.Execute(WorkerStatus status)
15:56:53    at MailClient.Commands.Command.Process(WorkerStatus status)

What can be causing this ? On another computer I did the same thing with another Google account without any issues.