AmigaOS 4.1 Update2: SM crashes if right after launching new mails are received

[halle-saale]

Just as described in the title line: I launch SimpleMail, it opens, fine.
If then I click the inbox folder and SimpleMail looks for new mails and if there are ones, then it crahes.
I have attached the coresponding Grim Reaper:

"Guru Meditation: 80000003
Task =x69b9b4d0 ('SimpleMail - IMAP thread')
verursacht einen Fehler des Typs ISI (Instruction Storage Interrupt) an Adresse 0x00000000"

This does NOT happen - as just foundout - if SimpleMail is already running and after a while a new message comes in. Odd.