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P3D v5 Missing Taxi Signs

I seem to have a problem with taxi igns not displaying in P3Dv5. Allow me to explain further. I am in the process of developing an across platform airport scenery (FSX, P3D and P3Dv5) for the use in our online IFR flights. The airport (LTFM- Tayakadin) is designed in ADEv1.76.6175 and uses a total of 765 taxi signs. While these show fully in FSX and P3Dv3.4 they do not show in P3Dv5. I have for the latter reduced the number substantially to ca. 600 and they now show. Is there a limitation in P3Dv5 to the number of displayable taxi signs that you know of. I am having thoughts to add the missing signs with Ground Polys but that is of course a sizeable amount of work.


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So I have resolved the problem with P3Dv5 by reducing the number of taxi signs to714, now they all show. Unfortunately I had to delete many of the Apron signs to achieve this, now I am faced with another problem. I made some Ground Polys for the signs and placed them in the normal manner, compiled the normal bgl, now all my previous GP signs have disappeared. Looking in the Scenery folder I see that the GP.bgl has gone from 420KB to 1KB. Thankfully I had a backup of the 420KB data so I copied it back to the Scenery Folder. Once again tried to add some GP,s but this time only compiled the GP.bgl. Details were as before with all my previous GP signs but not the new ones, if I Compile the normal bgl then all vanish and the status is as before GP.bgl has gone from 420KB to 1KB. This is really frustrating me as I do not have a clue to what is happening, perhaps a ADE guru could point me in the right direction. Sorry if this is long winded.