What server are you on? Test Are you in a raid? No. How many other people are in the zone and/or your group? 2 in group / zone Is everyone nuking? No, just me. What spells are you trying to cast? Multibind with Focused Blizzard of Arrows Rk. II, Marked Shots Rk. II, and Summer Sleet Rk. II What macros are you using? None. What are your graphic settings? Link to screenshots. What time-ish (and time zone) is it? 5:37 PM Eastern Time Do you have a bunch of other programs running at the same time? Yes, Firefox, Windows Explorer, Discord, Gamparse, GINA, Excel, ElderScrolls Online Launcher, EQ Log Parser, 2 Everquest Instances, Snipping Tool, OBS. Using a Level 115 Ranger vs a Combat Dummy. I'm dumb and had logging turned off, but here's a screenshot of the combat window from the end of the test (it bugged out after Focused Blizzard of Arrows Rk. II): I also have a video of the bug happening here. My spellbar locks up at about 2 minutes 50 seconds in.: Note that in the combat log, the message for Quick Time fading (You slow down) appears before casting Marked Shots Rk. II. In the video, my character still has 2 seconds left on the buff icon in the song window. I begin casting Focused Blizzard of Arrows Rk. II right as the Quick Time buff icon fades, and that's what locks up the spell bar. I had a similar occurrence in a raid this week on my Druid (on Xegony), where the message for Quick Time fading preceded the spell cast that locked my spell bar by two seconds: [Tue Jul 07 21:00:18 2020] You slow down. [Tue Jul 07 21:00:20 2020] You begin casting Horde of Hyperboreads Rk. II. I have a clip of the stream here. In my song window, the buff didn't appear to fade until 21:00:26. Horde of Hyperboreads had a cast time when I cast it at 21:00:20, after which my spell bar was locked up. P. S. Thanks Scornfire for helping me test this. Edit: YouTube video is no longer private.