There have been many multi-monitor regressions from OS X 10.8.5 to 10.9, and USB graphics has been significantly impacted.
Part of the confusion is not knowing which new problems are fixable by DisplayLink and which ones will require waiting for the next point releases by Apple.
We have a clearer picture of that now with DisplayLink’s version 2.1 driver final release. A number of things are greatly improved, including a fix for the new performance problems on 10.9 — performance is now back up to 10.8.5 levels.
However, we’re still recommending that anyone on 10.8.5 with a multiple-monitor setup, stay there until Apple has a chance to get out some point releases. In particular, multi-monitor setups of many types are losing configuration, often on sleep. And virtual graphics drivers like DisplayLink aren’t working for 2 or more displays. Both of these problems are new for 10.9.
See the comments on our original 10.9 multi-mon post for different problems reported by customers with DisplayLink and non-DisplayLink hardware. DisplayLink lists the 10.9 issues they’re aware of in the DisplayLink KB article for OS X 10.9.
So, progress .. but for most 3+ monitor users, 10.9 is still not workable. So we can’t recommend any of our Plugable brand products with DisplayLink for Mac, unfortunately. We’ll update as Apple and DisplayLink put out additional point releases.
Feel free to post your experiences in the comments below — it helps everyone to have the behaviors be known. Thanks!