I'm having a strange problem with my arduino IDE (1.6.5, but is reproducible on different IDE versions) with an Arduino Uno - after upgrading to Windows 10. Trying to compile and upload any sketch causes the IDE to begin rebuilding all of the core arduino files. The output with verbose compilation enabled is available at:
this is very slow, the 'blink' example sketch (output shown in the pastebin above) takes about 5 minutes to compile and upload. but does upload and run fine on the board.
I have searched for others that have had similar problems, but nobody has posted solutions, or have found bugs which have since been fixed. i'm really unsure why this is happening when i haven't experienced problems with the IDE prior to upgrading from Windows 8.1 to Windows 10. I'm surprised nobody else has had similar issues recently.
Thanks in advance