Hi,

Does the Rescan button on the Micro explorer also fail to reload?

Does switching to a different board and back again cause the changes to be detected?

Thanks. These days there is much more to cache due to extra intelligence of board options, deep search include paths etc. I think the current board properties are being cached and not cleared under certain conditions.

I suspected it but when I tested it worked okay but your report shows it is possible for different results depending on config.

I have also found that having a 2nd project in the solution set for a different board will also prevent the issue and that's how I often run 

Will try to have a tidy up weekend. It's frustrating when silly issues cause so much hassle. The good news is Arduino have really settled down with their high speed changes/development and so have microsoft with their new releases, same for atmel so things can mature again. 

No doubt I am going to regret saying that by Christmas, calm before the storm