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arc3371 said:
For some reason the computer won´t let me chose Ship assembly etc in MP game ( all other techs seems to work fine), this is the second game that the same thing happens, and yes we all got 1.3a without mods. Has this happened to anyone else?

A known problem in mp. You need to rehost. When you have rehosted, you properly will not have researched assemply line and need to research it one more time.

Believe this bug happens, when you are lagging.
 
Yes, it happens. The problem is that after finishing tech it doesn't get properly recorded on host's side.

To avoid this problem, always let pass one day (at least one midnight) before you start another tech in the slot where one has just finished. Otherwise you risk the need to re-research that technology again (plus necessary rehost).
 
In the Aussie games we have a rule where everyone pauses when a tech finishes when selecting a new tech. We haven't had problems with tech losses since.