Compile Error (Please Help)
Yes, you are not allowed to have more than 4 light styles on a same brush face... because vrad saves 1 lightmap per light style. More than four will fire the yellow message "too many light styles on a face at...".
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light
entities in the same room.
The only problem here is that if you name light entities, and you use the name to fire I/O to/from those light entities, vrad will calculate the lighting when they're ON and when they're OFF, so you'll have already 2 light styles. If there are only 2 more light styles in the area then the yellow message won't appear, but if there are more it will.
... but my overlays keep disappearing, and my overlays for the indicator lights are too, i think my map needs a complete overall and to edit it and get rid of the junk and maybe this will help my overlay issue, but because of the way i made this map, making all walls manually and stuff, it is actually very messy, but i know from future maps that to make a room and make it hollow hahahahaha, so lesson is learned from this map, but like i said it is my first hammer map lol, i think my map is actually nearly done, just gonna finish this room and sort those overlay indicator lights out and do exit then upload it for all to see and play, and i really hope i get comments on this one, because on my PTI one i uploaded i had no comments 
I'm sure I know what is happening to your overlays because it happened to me many times and it's annoying when you don't know what the fu** is happening! So, you surely placed the overlays on the brushes, then you turned/tied the brush into a func_detail or other brush entity and then overlays don't show up in game anymore. Check that, and if it is the case, it doesn't mean that the func_details can't allow overlays on them, it's just that the overlays take the number (ID) of the brush to stay fixed on it, but when you turn it into a func_detail the brush changes its ID and the overlay is not fixed on it anymore: and sometimes you can still see the overlay in hammer but it is not shown in game. So, baring this in mind, check and the only solution is to re-place again those overlays that don't show up, and don't make any change later to the brush where they lay, ok? I hope that halps... (it's not a solution to move to the world back again the func_details, because again the brush ID would have changed! ... 2 times)
useful tools and stuff here on TWP 
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You don't have to remove and re-apply the overlays. In the overlay's properties, select "brush faces", click on "pick..." and then click on the faces where you want the overlay to appear. (Hold down ctrl to select more than one.)
When you are done, click "apply" in the properties window. The view in Hammer may not update immediately, but it will show up in-game.
Other Portal 2 maps: Medusa Glare
Portal 1 maps: Try Anything Twice | Manic Mechanic
you should upload your vmf
When you are done, click "apply" in the properties window. The view in Hammer may not update immediately, but it will show up in-game.
Lol... that's true! never thought of that though...
EDIT
Also this happens to the overlays when you clip a brush on which there were some overlays... due to the change of brush ID as it was cut in at least 2 pcs...
useful tools and stuff here on TWP [spoiler]
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sorry all, i didnt check this thread and didnt know people would reply again cos i solved this issue lol,
thanks though for all your replys, i know how to fix the overlays now, that isnt a problem, i just have to make sure everytime i compile to check all my overlays first, and as for the lighting, i never have any lighting errors anymore, i am getting to understand how to stop those yellow messages now, when i compile my map now, it is nice and error free 
LuckyRJ
I hope you're still not putting a giant hollow box around your map.
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