K update, after a quick email to dovetail it would seem I had a build version which had been rolled back and is now all fixed so I can happily report Tim's Software works perfectly on win 10 with the latest version of FSX_SE.
So apologies to all, but if you do come across the same problem, just download FSX from steam again n re-install

Darren

Hi Tim & all,
               am unsure how many people will be aware that plan g will not create databases wiv newly downloaded version of FSX_SE.
Mainly it seems to be due to the fact dovetail has changed the name of the scenery.CFG to just "FSX.CFG and also it doesn't accept the location of the fsx.exe file either.

This may explain why people have broken copies due to fsx updates?

Any ways hope this info helps in some way.

Daz