Hi !
Can Compile this, but not to upload ?
Regards Christer / Sweden
I'm having the same issue. Able to Verify but when I click the 'Upload' button, get error 'Compilation failed'. I'm using the Basic Blink sketch with no modifications. I'm using Safari and tried it on Chrome as well with no luck.
I am having the same issue. Created a simple Blink sketch, and it won't download.
John
I am also seeing the same behaviour. I had been using the site successfully but yesterday it stopped working.
Testing with 'Blink' on an Arduino Nano 328p.
Verify works fine
Upload quickly fails reporting ' Compilation Failed. Please report on our forum.
HELP I want to get on with my project and this is stopping me 
I am getting the same error. Tried various boards, both genuine and clones. Also tried Chrome and Firefox to no avail. Every once in a while it will work but seems to be getting more persistent. Board shows as connected and the serial monitor works most of the time but now and again will not connect ("Serial port temporarily busy"). I hope this gets resolve before the 7th (last day for codebender).
Hi,
I've the same problem as described above. Can someone help? Using Arduino mega 2560.
Reply available here: [MERGED] Compilation failed - Web Editor - Arduino Forum
Hi, thanks.
But I can't open this link. Are You sure that it's still active?
@ mastrolinux
Link is either dead or restricted