Seamonkey nightly and Lightning nightly incompatibility ? (Win32)

Hello everyone,

I used to use SM nightly and Lightning nightly on a Windows platform, 
(Win8 enterprise).
I have seen since months an incompatibility between the two products. so 
I am now using the "aurora" versions.

The problem occur as a freeze of Seamonkey when login in my main account 
(IMAP) and entering my account password (my main account is the only one 
without its passwordd stored in Seamonkey).

Once frozen, the only way out is to kill the process.

I have since this problem for months now and I have been trying every 
now and then to use the latest nightlies, but still the same problem 
happen to me on my profile.
This profile works well with Seamonkey and Lightning Aurora (a2).
The problem is occurring with today's nightlies (20130115)

Is anyone else seeing the issue on Windows too ?

Thanks for your help,

Dominique