This morning I went to I Cor. 1 and there was some old markups I did using the Inductive Bible Study palette. I blocked the selection and click erase in my markup window and nothing happened. I tried blocking and erasing the markup on one word. Still, nothing happened. I restarted Logos and tried again. Still nothing happened. I then added one of my own custom underline markups, and it erased just fine but not the other markups, e.g.:
Before. The purple underline was just added, the markups on Jesus, Christ, and God, are older markups.

I blocked all the text like this:

I then selected erase from the top bar of the markup palette menu. Notice the purple line has disappeared but all other markups remain.

Speak to me! :-)