I agree the configuration of streaming profiles shouldn't matter here.The error doesn't occur during the actual clip deletion, but just after the deletions while refreshing the browser. It usually takes three refreshes to clear the error.
I use two different streaming profiles: one for low resolution wireless tablet monitors, and another for wired PC playback. The wireless streaming is stock streaming type 0, and the the reconfigured streaming type for PCs is as follows:
View attachment 163469
However, the UI error shows up under both streaming profiles on multiple machines. The streaming profile is the only thing I can think of that is not standard...
Could you open the developer console after these errors have happened (ctrl + shift + i) and on the Console tab, copy or screenshot the error messages? They might include something called a stack trace which will tell me more line numbers of code that led up to the error and that would help me understand why it is happening.