Have you tried adding the line below to your submision config?

submission_client_workarounds = whitespace-before-path

I tried, also with all other workarounds, unfortunately that (alone) does not help :(

Ralf

-- 
Ralf Becker
EGroupware GmbH [www.egroupware.org]
Handelsregister HRB Kaiserslautern 3587
Geschäftsführer Birgit und Ralf Becker
Leibnizstr. 17, 67663 Kaiserslautern, Germany
Telefon +49 631 31657-0