After upgrading to 1.8.10 the compiler cant't find #include <avr/pgmspace.h> anymore (File not found)
The whole controller was throttled down to maybe 5% of it's norma speed, everything was working like in super slow motion.
After including the pgmspace.h manually nothing changed, eveything in slow motion.
Then i downgraded to 1.8.9 and everything was back to normal...strange.
I can't give additonal infos, the compiler went trough normal.
They are currently at 1.8.13 so 1.8.10 would be considered a little older.
You could try the zipped version of 1.8.13 as a standalone without it affecting your current IDE.
By "1.8.10", @intstarep is referring to the version number of the latest Arduino SAMD Boards platform release, which just came out yesterday:
You can install it via Boards Manager.
@intstarep has opened a bug report about this:
There was a problem with the SPI clock timing. Now solved. If someone finds this topic with the same problem, the SPI lib must be updatet. Here's the detail:
facchinm closed this in #579 2 days ago