I am using linux, SMP Debian 5.2.9-2 (2019-08-21) x86_64 GNU/Linux.
As I mention in the subject, there are times (so far two or three times. This is the second day I observe the bug. The first one occurred last week, and my memory is a bit hazy.) when the HTML Mail Question (that asks regarding the HTML formatting for recipients who are not specified as being able to receive HTML mails) pops up, the size of the dialog window is incorrect and hides the [CANCEL]/[SEND] button.
I am attaching the screen capture when it happened today.
( I now notice there seem to be the upper corner of the buttons that got hidden in the too small window.)
When I close the incorrectly sized window by clicking on the X of the window pane, and retried sending the e-mail, the pop up windows showed up in correct size and I could see [CANCEL] [SEND] buttons.
Very annoying, especially for the first time.