This is a community Forum not a delevloper support user Forum
Beside you got a lot of people here with massive knowlege (which you cant use cuse its usually server related)
the community can only support if we have time and if we get provided with the information we need to solve such things
and of course IF were intrested - which depends on the attitude of the questioner and of course type of problem
personally no idea in that case - zdesktop is beta nothing more
if you want an developer go to bugzilla.zimbra.com make an account - and make an bug report with as much additional information possible - in a seriouse adult way
then you got a chance to write with some devs

but dont expect here help to solve YOUR iusse its more about finding the source and fix it for the future
if you need personal support go to a company whichs offers and pay for a support contract or live with community support
same counts for all kinds of software no mather opensource or not