I had such problems and endless more after updating to OS X 10.9.
I wish I could reload OS X10.8. The new operating system is full of surprises, a few unnecessary changes or useless things added. This is in total divergence of the old Apple philosophy. After OS X 10.5 any update exponentially increased the number of problems!
- That a number of Apps did not work for a while, was a relatively minor problem!
- reinstalling a new Canon network printer took me sidelong recommendations from Canon to clean the library and I had to use Terminal commands (arp, ping) and auxiliary programs to get it working. This is not how Apple lovers work...
- Baffling error messages (drive already in use...??) appear after first time use of the internal CD/DVD Drive for burning an audio CD. However, turning off and on the iMac 27 i7 let me use the burner again, but...
- after this, my external archives â both WD MyBook Thunderbolt Duo worked perfektly under 10.9 for a few weeks - lost their RAID1 status and changed to single status while I don't have access to the data any more! WD already gave alarm, but I guess, Apple screwed it all up...