So, again, stand-alone install of OF here, running the 2.3 patch. Loading up the Luftwaffe doctrine, it allows me to build 88s and smaller machine gun emplacements. Cool--I like this. Except that when I order a crew to man a gun, they don't. They'll turn the gun blue, but none of them will actually "get on" it and just sort of stand around, the gun does nothing. I had a Stuart sitting infront of one of my 88s and it didn't do anything...
Am I doing something wrong here>
When you build a Flak36 or the Flakvierling38 a crew will automatically spawn on it when it's finished being built. By the sounds of it you didn't finish building it. When you place the weapon where you want it to be built, the "ghost" will turn solid when the building units get close to it, however there is a while bar above it which shows the progress of the weapon being built. As i said, when it's finished a crew will automatically spawn and jump on it.
He did say the Weapon becomes Blue. Indicating that its already finished. Maybe its a bug. The details are sketchy though: Maybe the map you're playing on has issues that don't allow certain actions to be done. Happens to me a lot in player made maps. Otherwise its probably something else.