I just found another issue:
I set a BP in line 33, close the file and reopen it.
The list says I have a BP in line 33, but the icon appears in 34.
If I now click in the margin on line 34 nothing happens, I can not add or remove the BP-icon, if I right-click it says "edit, remove ...", but nothing happens.
If I click the margin in line 33, I get two identical entries in the BP-list and a BP-icon in 33, if I click again, both entries (and the icon) are removed.