qmail+vpopmail home directory problem

Virtualmin is one of the few web panels supporting qmail and I'm grateful for this, however there's seems to be a glitch in virtualmin with certain qmail+vpopmail setups.
When the number of hosted domains reaches some point, my vpopmail starts to shatter domains in multiple directories.
Example:

classic dir: /home/vpopmail/domains/domain.com

my situation: vpopmail has populated /home/vpopmail/domains/ to some point, then started to put new domains in /home/vpopmail/domains/a/; after "a" gets filled it will probably start putting new domains in "b" and so on.

When creating new virtual servers virtualmin tries to put a .qmail file in /home/vpopmail/domains/domain.com while the correct directory is /home/vpopmail/domains/a/domain.com .. therefore the mail feature gets disabled.

Any workaround for this one?
Thanks in advance!

Status: 
Closed (fixed)