Digital Light & Color

1. open Level transformation
2. click Align To Vertical button to position the Line Overlay vertically
3. go to Settings, click Reset and right away click again Align To Vertical button -> you (might) get an error message Illegal Angle Value

However, if you wait a bit before clicking again Align To Vertical button, the Line Overlay blinks once as it refreshes and after you click Align To Vertical button again, there in no error message.

I believe that on fast computers the Line Overlay refreshes instantly with the Reset command, so there is no chance for the error message.
On my computer the delay is about 2 seconds.

I can't reproduce this here, but I did rewrite the code for the next release to eliminate the unnecessary delay which hopefully will fix it for you.

You will have a fast computer :).
Thanks.