Upgrade of avr library crashes my arduino

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hello,

i upgraded avr library suggested today , arduino script not working anymore. have systematic error when opening file on sd card (sd.open) while running fine since 3 years. havne't found way know avr library realease.
will full upgrade on 1.8.0 ?
i have pc older version , check, wondering if has experienced such issue. using arduino uno , ide 1.6.7


thanks

please post either error msg's or decent screen shots.

use code tags ( </> ) post error msg. please.


Arduino Forum > Using Arduino > Installation & Troubleshooting > Upgrade of avr library crashes my arduino


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