column sizes automatically revert to 0 width

[nkennington]

I sometimes find the widths of some attribute columns are set to zero (i.e. you can't read Subject or Sender attributes). Often when I try to drag the column widths to readable sizes (following the instructions here: https://support.mozilla.org/en-US/kb/me ... win10:tb52) , they automatically revert to 0 width. How can I resize the column widths so that I can read the attributes?

[DanRaisch]

The column width settings should hold between restarts of Thunderbird. Are you running anything like Ccleander on that system?
What security software is running on that machine?

[nkennington]

The column width settings should hold between restarts of Thunderbird. Are you running anything like Ccleander on that system?
What security software is running on that machine?

Hi Dan,
My recent experience is that the column widths reset to zero for some reason when I move the cursor to the column headings to adjust the widths. I don't believe that I am running anything like Ccleander. (I have never heard of it.) I am running Avira Antivirus and NoScript as an add-on to FireFox.
Thank you for your attention,
Ned Kennington

[DanRaisch]

Nothing in Firefox will have any impact on column width settings in Thunderbird. Do you have any extensions installed in Thunderbird?