They do work correctly for me (and I suspect 00zim00 is correct on the cause).

When you say that you are "unable to construct Assembly lines" Do u mean its not showing up on the list at all. Or are you attempting to place the assembly lines as if they are buildings? Those items are not buildings, they are like a research project or culture festival where they will just build in the queue and when complete you get the population automatically at the end.

Hehe that's ok, your not stupid seen some other posts asking the same thing. Maybe they need to have it easier to understand in the tool tip or something

I am finding the same issue.

ALL evolutions of the 'Assembly' structure appear in the build list (instead of just the base one which automatically improves later).

When selecting an empty tile, then selecting any of the 'Assembly' structures, it jumps back to the capital like it would if the planet were full. When selecting the tile again, the shadow does not appear on the tile like a normal structure, and when you attempt to click 'build' (or double click) it jumps back to the capital, not building the structure.

Heres some screenies.

1) normal looking plot, normal structure selected, normal shadow:

2) Hover over the Assembly structure (in this case, just the base one as I still say the others shouldn't be there):

3) select the Assembly structure, jumps back to the capital:

4) select the tile again - no shadow:

5) click build - jumps back to the capital (also note the entire line of Assembly structures):

kinsoa, is this what yor seeing? (get it? yor?) 

Ah, that makes sense I guess. Yeah I wasnt really sure what that meant in that its like a research project. I told it to build a ton of them on a few planets to see what would happen, other planets are stuck on a population of like 2.5 or something awful. I'm guessing that means Yor can't make use of any population related bonuses...

Well i noticed the power matrix gets bonuses from pop tiles as its a pop building, strange I know. I guess cos its like a yor mainframe that helps regulate the population

Also in regards to the naming convention. All they have to do is put the world "project" at the end and people wont get as confused. EG. Assembly Project, Fast Assemble Project. Tho i guess you will then have people who are confused that it has a time limit and dosnt last forever like the other projects hehe cant win!