We have identified the bug in iCloud server implementation of IMAP that causes this issue. The issue is that iCloud sends more and invalid data when chunk downloads (this is an IMAP protocol optimization) feature of IMAP is used. We’ll be able to workaround it in that way, that we’ll disable this chunk downloading for iCloud servers. However the bug is on iCloud side. We’ll try to make a build with this workaround as soon as possible. There is also a quick workaround for you even with the current version. Go to your iCloud account settings (Menu->Accounts), select Diagnosticts tab and put this parameter to Parameters (Advanced options) field: --imap-disable-chunked-download
And please let us know if it helped.
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