Hello again
celestian,
Unfortunately I have found another peculiarity. I had reported the oddity to the 5E bug reports thread and was told by
Moon Wizard that the issue is probably caused by an extension. Low and behold, after a little more investigation, I have confirmed he is correct and that your fine extension is the culprit.
The bug report can be found
here, posts 761 and 762.
Attached is a screen shot indicating that your extension is the only one loaded.
(When it is not loaded the problem is not observed).
Portions of the sub windows in the screen shot are:
(1) the chat - indicates Advanced Effects is the only extension loaded
(2) a brand new, empty character sheet
(3) the AC/Init/Speed sub dialog - with errors circled.
Attachment 50074