Hi, have you tried installing a known version that doesn't experience the issue? Have you tried uninstalling / reinstalling the Horizon client?
I reinstalled, no dice. Then I went back a version or two (it's been a month since I tried) and it behaved the same. I'm just not sure how far back to go. I guess that'd be the next thing to try... a really old version.
If you have any other ideas, they'd be appreciated. It's so weird that pasting into a field locks up the app.
Do you know if any of any of the horizon server compontents changed?