I assume this has been asked before, but couldn't find it... There is quite a lot of threads to search if you don't know what to look for
So I thought I'd make a thread of my own.
So...
What is the yellow banner (Supply: 0,0,0,0,0,0etcetcetc) on the main menu?
2 First, it is "broken" only if you selected the optional where you need to have engineers repair conquered factories (and major ports). You dont need to. You repair them leaving an ENG there any impulse and keep it there till next turn. It's free.
If you are referring to Strat Bombing, then I believe they are "destroyed" and you need to pay for the rebuild, I believe it may be haf the cost to build (4 bps?) but I never had to do it in MWIF so I dont know which way to do it.
3 You can save as much oil as you want, just you need to save it in cities (or ports?), if the city is in a port or a Capital, you can save more there. You assign resources to save in the production step. However if any country is neutral, cannot save more than one per turn while this state remains.
The yellow bar with the numbers were added to be able to log calculation times. When the game first was released, calculation times were too long. After this was fixed, they never have been removed. You can ignore them.